Remove non-existing dependency

We have removed the system-images sdk zip, so remove the tracking of it
as a dependency for the addon.

Bug: 205008975
Test: presubmit
Change-Id: I14e47d6418f355c6c7db7444a25c3030f36a3f92
diff --git a/build/tools/sdk_repo.mk b/build/tools/sdk_repo.mk
index c40dc08..febd8fd 100644
--- a/build/tools/sdk_repo.mk
+++ b/build/tools/sdk_repo.mk
@@ -127,9 +127,6 @@
 
 ifneq ($(filter sdk,$(MAKECMDGOALS)),)
 
-SDK_SYSIMG_DEPS += \
-    $(call sdk-repo-pkg-zip,$(HOST_OS),$(MAIN_SDK_ZIP),system-images) \
-
 # All these go in the main repository.xml
 $(eval $(call mk-sdk-repo-pkg-1,SDK_REPO_XML_ARGS,$(HOST_OS),$(MAIN_SDK_ZIP),docs))
 $(eval $(call mk-sdk-repo-pkg-2,SDK_REPO_XML_ARGS,$(HOST_OS),$(MAIN_SDK_ZIP),platforms))