RDKDEV-1130: Weak assigment of APPLICATION_IPK_SERVER_PATH

With this change APPLICATION_IPK_SERVER_PATH can be override from local.conf
for custom/local builds.

Author: meecash

conf/machine/include/application.inc

@@ -8,7 +8,7 @@ RDK_ARTIFACTS_BASE_URL ?= ""
 APPLICATION_LAYER_VERSION = "5.0.0"
 
 APPLICATION_IPK_PATH = "application-release/${APPLICATION_LAYER_VERSION}/${MACHINE}/ipks/${BUILD_VARIANT}"
-APPLICATION_IPK_SERVER_PATH = "${RDK_ARTIFACTS_BASE_URL}/${APPLICATION_IPK_PATH}"
+APPLICATION_IPK_SERVER_PATH ?= "${RDK_ARTIFACTS_BASE_URL}/${APPLICATION_IPK_PATH}"
 
 # To set the remote feeds
 IPK_FEED_URIS += " \