AndroidKernel: Explicitly mark certain targets as phony

kerneltags and kernelconfig are phony targets, so mark them
with .PHONY.

Change-Id: I7089d819ff7c64a7b07a0ca5d9de01ec216275b6
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
diff --git a/AndroidKernel.mk b/AndroidKernel.mk
index 26e5cb8..7233829 100644
--- a/AndroidKernel.mk
+++ b/AndroidKernel.mk
@@ -210,9 +210,11 @@
 			echo $(KERNEL_CONFIG_OVERRIDE) >> $(KERNEL_OUT)/.config; \
 			$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) oldconfig; fi
 
+.PHONY: kerneltags
 kerneltags: $(KERNEL_OUT) $(KERNEL_CONFIG)
 	$(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) tags
 
+.PHONY: kernelconfig
 kernelconfig: $(KERNEL_OUT) $(KERNEL_CONFIG)
 	env KCONFIG_NOTIMESTAMP=true \
 	     $(MAKE) -C $(TARGET_KERNEL_SOURCE) O=$(BUILD_ROOT_LOC)$(KERNEL_OUT) $(KERNEL_MAKE_ENV) ARCH=$(KERNEL_ARCH) CROSS_COMPILE=$(KERNEL_CROSS_COMPILE) menuconfig