hikey960: Bump default kernel to 4.19

This moves the default HiKey960 kernel to 4.19.

This change should be applied after prebuilt a 4.19 kernel
is updated which has the performance hacks applied.

Change-Id: I035fe6c83f1bdfe7460a55177036b5060bcd13c1
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/hikey960.mk b/hikey960.mk
index 232150b..a473949 100644
--- a/hikey960.mk
+++ b/hikey960.mk
@@ -1,5 +1,5 @@
 ifndef TARGET_KERNEL_USE
-TARGET_KERNEL_USE=4.14
+TARGET_KERNEL_USE=4.19
 endif
 TARGET_PREBUILT_KERNEL := device/linaro/hikey-kernel/Image.gz-dtb-hikey960-$(TARGET_KERNEL_USE)
 TARGET_PREBUILT_DTB := device/linaro/hikey-kernel/hi3660-hikey960.dtb-$(TARGET_KERNEL_USE)