Moving Cuttlefish from 3.18 to 4.4

BUG=68769346

Change-Id: I78682f96e8e0ba4531097d5abbce6dff572eafa5
diff --git a/shared/device.mk b/shared/device.mk
index fad6e44..89f6352 100644
--- a/shared/device.mk
+++ b/shared/device.mk
@@ -15,7 +15,7 @@
 #
 
 ifeq (,$(CUTTLEFISH_KERNEL))
-CUTTLEFISH_KERNEL := device/google/cuttlefish_kernel/3.18-x86_64/kernel
+CUTTLEFISH_KERNEL := device/google/cuttlefish_kernel/4.4-x86_64/kernel
 endif
 
 PRODUCT_COPY_FILES += $(CUTTLEFISH_KERNEL):kernel