Move emu_img_zip.mk to a different folder

build/tasks is included at a wrong time and
the order is important.

Bug: 417070498
Bug: 416327221
Test: lunch sdk_gcar_x86_64-next-userdebug, m
Change-Id: I4ef71a35840d6bcdcdd0403090f65116fde1a8b7
Signed-off-by: Roman Kiryanov <rkir@google.com>