lvgl: bump revision

This brings in a couple fixes from upstream. Most notably it fixes an
issue with kscan events from outside the touchpanel range and addresses
spurious kscan events on certain i2c controllers. Both have been
observed on Arduino Nano 33 BLE.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@huawei.com>

meta-zephyr-core/recipes-kernel/zephyr-kernel/zephyr-kernel-src-3.0.0.inc

@@ -45,7 +45,7 @@ SRCREV_xtensa = "0e577021bb66e644afd067cd9f7c71ab11b62b3d"
 SRCREV_libmetal = "f237c9d420a51cc43bc37d744e41191ad613f348"
 SRCREV_littlefs = "33509ed9c3d369cdb9d909cd40c5eea8f64a902c"
 SRCREV_loramac-node = "12019623bbad9eb54fe51066847a7cbd4b4eac57"
-SRCREV_lvgl = "a2e17073e5208c221e24e3c2b3b6c473e878bd1e"
+SRCREV_lvgl = "f6541c6015662715d331a5cf71216707122e4e22"
 SRCREV_lz4 = "8e303c264fc21c2116dc612658003a22e933124d"
 SRCREV_mbedtls = "3e3e58a92de76069730c63e0d524f40fea948a61"
 SRCREV_mcuboot = "89936c338e46f43cb177a8b928cd80b90f3ace8f"