For targets that uses mainline kernel, the kernel tree usually only
contains configs on top of the upstream repository.
In such case, if we put the configs in elsewhere, we can simply just
track the upstream kernel repo, without needing to import configs.
Example usage:
TARGET_KERNEL_CONFIG_EXT := \
$(COMMON_PATH)/kconfig/platform_defconfig \
$(COMMON_PATH)/kconfig/common-addons.config
TARGET_KERNEL_CONFIG_EXT += \
$(DEVICE_PATH)/kconfig/device.config
Change-Id: I021ffb76d0c0612343cff7b5c81541c2b88ef7e6
1b1687b456