kernel: Handle kernel modules correctly

Place kernel module output in the correct location.
Perform depmod steps (copied from build-image-kernel-modules function in
build/make/core/Makefile).
See: https://source.android.com/devices/architecture/kernel/modular-kernels

Change-Id: I6e70012a5c1acdb276f9bee0d57631d2805f71ea

build/tasks/kernel.mk

@@ -197,9 +197,13 @@ KERNEL_HEADERS_INSTALL_STAMP := $(KERNEL_OUT)/.headers_install_stamp
 ifeq ($(NEED_KERNEL_MODULE_ROOT),true)
 KERNEL_MODULES_INSTALL := root
 KERNEL_MODULES_OUT := $(TARGET_ROOT_OUT)/lib/modules
+KERNEL_DEPMOD_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_recovery)
+KERNEL_MODULE_MOUNTPOINT :=
 else
-KERNEL_MODULES_INSTALL := system
-KERNEL_MODULES_OUT := $(TARGET_OUT)/lib/modules
+KERNEL_MODULES_INSTALL := $(TARGET_COPY_OUT_VENDOR)
+KERNEL_MODULES_OUT := $(TARGET_OUT_VENDOR)/lib/modules
+KERNEL_DEPMOD_STAGING_DIR := $(call intermediates-dir-for,PACKAGING,depmod_vendor)
+KERNEL_MODULE_MOUNTPOINT := vendor
 endif
 
 TARGET_KERNEL_CROSS_COMPILE_PREFIX := $(strip $(TARGET_KERNEL_CROSS_COMPILE_PREFIX))
@@ -248,6 +252,7 @@ $(KERNEL_OUT_STAMP):
 	$(hide) mkdir -p $(KERNEL_OUT)
 	$(hide) rm -rf $(KERNEL_MODULES_OUT)
 	$(hide) mkdir -p $(KERNEL_MODULES_OUT)
+	$(hide) rm -rf $(KERNEL_DEPMOD_STAGING_DIR)
 	$(hide) touch $@
 
 KERNEL_ADDITIONAL_CONFIG_OUT := $(KERNEL_OUT)/.additional_config
@@ -293,7 +298,11 @@ INSTALLED_KERNEL_MODULES:
 				$(KERNEL_TOOLCHAIN_PATH)strip --strip-unneeded $$f; \
 				mv $$f $(KERNEL_MODULES_OUT); \
 			done && \
-			rm -rf $$mpath; \
+			rm -rf $$mpath && \
+			mkdir -p $(KERNEL_DEPMOD_STAGING_DIR)/lib/modules/0.0/$(KERNEL_MODULE_MOUNTPOINT)/lib/modules && \
+			find $(KERNEL_MODULES_OUT) -name *.ko -exec cp {} $(KERNEL_DEPMOD_STAGING_DIR)/lib/modules/0.0/$(KERNEL_MODULE_MOUNTPOINT)/lib/modules \; && \
+			$(DEPMOD) -b $(KERNEL_DEPMOD_STAGING_DIR) 0.0 && \
+			sed -e 's/\(.*modules.*\):/\/\1:/g' -e 's/ \([^ ]*modules[^ ]*\)/ \/\1/g' $(KERNEL_DEPMOD_STAGING_DIR)/lib/modules/0.0/modules.dep > $(KERNEL_MODULES_OUT)/modules.dep; \
 		fi
 
 $(TARGET_KERNEL_MODULES): TARGET_KERNEL_BINARIES