db845c: rb5: Switch default TARGET_KERNEL_USE to 5.15 am: bf57637c5b am: 7867423e05 am: a681a6c064

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/1976891

Change-Id: Ie5b6b528e49e7947ff805cdf4733fddca6efe4ba