Fix size and sha1sum for some sdk targets

Targets such as sdk_google_phone_{x86,arm,...}-sdk
have wrong size and sha1sum in the repo-sys-img.xml,
because the sdk_repo.mk file incorrectly over-writes
the final images zip.

bug: 20927015

Change-Id: I151c8759c299d4a943f00ca2734ef65dea727262
1 file changed