Adding product.img for `fastboot flashall`

Bug: 64195575
Test: fastboot flashall

Change-Id: Ifd119650dd3316508870df0dfc770099e95ae1d1
Merged-In: Ifd119650dd3316508870df0dfc770099e95ae1d1
(cherry picked from commit 0afc6b07f13b7bc8ee5aaf23d41c48843441870a)
1 file changed