db845c/rb5: Switch to android-6.1 as the default kernel version am: 7652f47a76 am: cf31160181 am: a76d8c74ad

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2619251

Change-Id: I4fdcf0df04b3ed07ef473cea3f6181c5a378616b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>