db845c/rb5: Switch to android-6.1 as the default kernel version

Switch DB845c and RB5 to using android-6.1 prebuilt GKI
binaries by default.

Change-Id: Ica022c3803eacbffc66baa93417eb8ddb931ef39
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
diff --git a/db845c/device.mk b/db845c/device.mk
index ef754c1..637cd0a 100644
--- a/db845c/device.mk
+++ b/db845c/device.mk
@@ -53,6 +53,6 @@
 $(call inherit-product-if-exists, vendor/linaro/rb5/$(EXPECTED_LINARO_VENDOR_VERSION)/device.mk)
 
 TARGET_HARDWARE := db845c
-TARGET_KERNEL_USE ?= 5.15
+TARGET_KERNEL_USE ?= 6.1
 
 include device/linaro/dragonboard/device-common.mk
diff --git a/rb5/device.mk b/rb5/device.mk
index 6f4f75a..f0100cf 100644
--- a/rb5/device.mk
+++ b/rb5/device.mk
@@ -47,7 +47,7 @@
 
 TARGET_DTB := qrb5165-rb5.dtb
 TARGET_HARDWARE := rb5
-TARGET_KERNEL_USE ?= 5.15
+TARGET_KERNEL_USE ?= 6.1
 
 include device/linaro/dragonboard/device-common.mk