zephyr-kernel/2.7.0: add recipe

https://github.com/zephyrproject-rtos/zephyr/commits/v2.7-branch



Keeping the default PREFERRED_VERSION to 2.6.1 for now.

Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>

recipes-kernel/zephyr-kernel/zephyr-kernel-src-2.7.0.inc

+SRCREV_FORMAT = "default_cmsis"
+SRCREV_default = "8a97c83040c0257d98c329dde55ae10e68544688"
+SRCREV_cmsis = "b0612c97c1401feeb4160add6462c3627fe90fc7"
+SRCREV_nordic = "a6e5299041f152da5ae0ab17b2e44e088bb96d6d"
+SRCREV_stm32 = "5c8275071ec1cf160bfe8c18bbd9330a7d714dc8"
+SRCREV_open-amp = "6010f0523cbc75f551d9256cf782f173177acdef"
+SRCREV_openthread = "5d706547ebcb0a85e11412bcd88e80e2af98c74d"
+SRCREV_libmetal = "39d049d4ae68e6f6d595fce7de1dcfc1024fb4eb"
+SRCREV_tinycrypt = "3e9a49d2672ec01435ffbf0d788db6d95ef28de0"
+SRCREV_mbedtls = "5765cb7f75a9973ae9232d438e361a9d7bbc49e7"
+
+ZEPHYR_BRANCH = "v2.7-branch"
+PV = "2.7.0+git${SRCPV}"
+
+SRC_URI:append = " file://0001-cmake-add-yocto-toolchain.patch \
+                    file://0001-x86-fix-efi-binary-generation-issue-in-cross-compila.patch \
+                    "