whyred: Enforce common device & vendor tree presence

A compiled build has no chance of booting without the common device setup
and the prebuilt binaries, so fail the build if those are not present.

Change-Id: Iadd43e887d426732e549969ab8deb14194ca818d

BoardConfig.mk

@@ -23,7 +23,7 @@
 #
 
 # Inherit from sdm660-common
--include device/xiaomi/sdm660-common/BoardConfigCommon.mk
+include device/xiaomi/sdm660-common/BoardConfigCommon.mk
 
 DEVICE_PATH := device/xiaomi/whyred
 
@@ -56,4 +56,4 @@ TARGET_RECOVERY_FSTAB := $(DEVICE_PATH)/rootdir/etc/fstab.qcom
 VENDOR_SECURITY_PATCH := 2018-11-01
 
 # Inherit the proprietary files
--include vendor/xiaomi/whyred/BoardConfigVendor.mk
+include vendor/xiaomi/whyred/BoardConfigVendor.mk

device.mk

@@ -78,5 +78,5 @@ PRODUCT_PACKAGES += \
 PRODUCT_PACKAGES += \
     WhyredWifiOverlay
 
-# Inherit proprietary files
-$(call inherit-product-if-exists, vendor/xiaomi/whyred/whyred-vendor.mk)
+# Inherit the proprietary files
+$(call inherit-product, vendor/xiaomi/whyred/whyred-vendor.mk)