zephyr-kernel: drop support for zephyr v2.6.1

v2.7.1 is the LTS release and we'll be adding support fr v3.0.0 in the
subsequent patch. Drop support for v2.6.1.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@huawei.com>
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>

meta-zephyr-core/recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.6.1.inc

-SRCREV_FORMAT = "default_cmsis"
-SRCREV_default = "c8755e0b46bd9e171fae38adc1c614197b8ac2cd"
-SRCREV_cmsis = "c3bd2094f92d574377f7af2aec147ae181aa5f8e"
-SRCREV_atmel = "d17b7dd92d209b20bc1e15431d068edc29bf438d"
-SRCREV_altera = "23c1c1dd7a0c1cc9a399509d1819375847c95b97"
-SRCREV_canopennode = "468d350028a975b96563e58344de48281a0ab371"
-SRCREV_civetweb = "e6903b80c09d17cd1a8bb32e40080005558aad29"
-SRCREV_espressif = "22e757632677e3579e6f20bb9955fffb2e1b3e1c"
-SRCREV_fatfs = "1d1fcc725aa1cb3c32f366e0c53d7490d0fe1109"
-SRCREV_cypress = "81a059f21435bc7e315bccd720da5a9b615bbb50"
-SRCREV_infineon = "f1fa8241f8786198ba41155413243de36ed878a5"
-SRCREV_nordic = "574493fe29c79140df4827ab5d4a23df79d03681"
-SRCREV_openisa = "40d049f69c50b58ea20473bee14cf93f518bf262"
-SRCREV_nuvoton = "b4d31f33238713a568e23618845702fadd67386f"
-SRCREV_microchip = "b280eec5d3b1296b231117c1999bcd0269b6ecc4"
-SRCREV_silabs = "be39d4eebeddac6e18e9c0c3ba1b31ad1e82eaed"
-SRCREV_st = "b52fdbf4b62439be9fab9bb4bae9690a42d2fb14"
-SRCREV_stm32 = "f8ff8d25aa0a9e65948040c7b47ec67f3fa300df"
-SRCREV_ti = "3da6fae25fc44ec830fac4a92787b585ff55435e"
-SRCREV_libmetal = "39d049d4ae68e6f6d595fce7de1dcfc1024fb4eb"
-SRCREV_quicklogic = "b3a66fe6d04d87fd1533a5c8de51d0599fcd08d0"
-SRCREV_lvgl = "31acbaa36e9e74ab88ac81e3d21e7f1d00a71136"
-SRCREV_mbedtls = "5765cb7f75a9973ae9232d438e361a9d7bbc49e7"
-SRCREV_mcuboot = "2fce9769b191411d580bbc65b043956c2ae9307e"
-SRCREV_mcumgr = "5c5055f5a7565f8152d75fcecf07262928b4d56e"
-SRCREV_net-tools = "f49bd1354616fae4093bf36e5eaee43c51a55127"
-SRCREV_nxp = "0d11138724959e1162777d9206f841ccdf64348e"
-SRCREV_open-amp = "6010f0523cbc75f551d9256cf782f173177acdef"
-SRCREV_loramac-node = "2cee5f7295ff0ff804bf06fea5de006bc7cd121e"
-SRCREV_openthread = "385e19da1ae15f27872c2543b97276a42f102ead"
-SRCREV_segger = "3a52ab222133193802d3c3b4d21730b9b1f1d2f6"
-SRCREV_sof = "779f28ed465c03899c8a7d4aaf399856f4e51158"
-SRCREV_tinycbor = "40daca97b478989884bffb5226e9ab73ca54b8c4"
-SRCREV_tinycrypt = "3e9a49d2672ec01435ffbf0d788db6d95ef28de0"
-SRCREV_littlefs = "9e4498d1c73009acd84bb36036ee5e2869112a6c"
-SRCREV_mipi-sys-t = "75e671550ac1acb502f315fe4952514dc73f7bfb"
-SRCREV_nrf_hw_models = "a47e326ca772ddd14cc3b9d4ca30a9ab44ecca16"
-SRCREV_TraceRecorder = "5b5f8d7adbf0e93a09087e8f5708f0eebb8b25bf"
-SRCREV_xtensa = "2f04b615cd5ad3a1b8abef33f9bdd10cc1990ed6"
-SRCREV_edtt = "7dd56fc100d79cc45c33d43e7401d1803e26f6e7"
-SRCREV_tfm = "e18b7a9b040b5b5324520388047c9e7d678447e6"
-SRCREV_tfm-mcuboot = "4aa516e7281fc6f9a2dce0b0efda9acc580fa254"
-SRCREV_nanopb = "d148bd26718e4c10414f07a7eb1bd24c62e56c5d"
-SRCREV_tensorflow = "dc70a45a7cc12c25726a32cd91b28be59e7bc596"
-
-ZEPHYR_BRANCH = "v2.6-branch"
-PV = "2.6.1+git${SRCPV}"
-
-SRC_URI:append = " \
-    file://0001-cmake-add-yocto-toolchain.patch \
-    file://0001-x86-fix-efi-binary-generation-issue-in-cross-compila.patch \
-    file://arduino-nano-33-ble-storage-partition.patch \
-    file://dtc.patch \
-"