Fix dpkg cache hash value relative to file path issue (sonic-net#4894)

Author: xumia

Makefile.cache

@@ -68,7 +68,7 @@
 # Run the 'touch cache.skip.common' command in the base directory to exclude the common files from caching
 SONIC_COMMON_FILES_LIST :=  $(if $(wildcard cache.skip.common),, .platform slave.mk rules/functions Makefile.cache)
 SONIC_COMMON_FLAGS_LIST :=  $(CONFIGURED_PLATFORM) \
-                            $(SONIC_DPKG_CACHE_SOURCE) $(SONIC_DEBUGGING_ON) \
+                            $(SONIC_DEBUGGING_ON) \
                             $(SONIC_PROFILING_ON) $(SONIC_ENABLE_SYNCD_RPC)
 SONIC_COMMON_DPKG_LIST  :=  debian/control debian/changelog debian/rules \
                             debian/compat debian/install debian/copyright