Fix typo: DLKIMMAGE

Fix two typos in Makefile.

It turns out that BOARD_ODM_VENDOR_DLKMIMAGE is not correct.
Need to replace it with BOARD_PREBUILT_ODM_DLKMIMAGE.

Test: use grep to check usage
Change-Id: If73b15d7abb7504aa313d616f6cef2d80d76705d
diff --git a/core/Makefile b/core/Makefile
index 3579142..02f60cf 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4678,13 +4678,13 @@
 
 ifdef BUILDING_VENDOR_DLKM_IMAGE
   $(BUILT_TARGET_FILES_PACKAGE): $(INTERNAL_VENDOR_DLKMIMAGE_FILES)
-else ifdef BOARD_PREBUILT_VENDOR_DLKIMMAGE
+else ifdef BOARD_PREBUILT_VENDOR_DLKMIMAGE
   $(BUILT_TARGET_FILES_PACKAGE): $(INSTALLED_VENDOR_DLKMIMAGE_TARGET)
 endif
 
 ifdef BUILDING_ODM_DLKM_IMAGE
   $(BUILT_TARGET_FILES_PACKAGE): $(INTERNAL_ODM_DLKMIMAGE_FILES)
-else ifdef BOARD_ODM_VENDOR_DLKIMMAGE
+else ifdef BOARD_PREBUILT_ODM_DLKMIMAGE
   $(BUILT_TARGET_FILES_PACKAGE): $(INSTALLED_ODM_DLKMIMAGE_TARGET)
 endif