sdk: add vendor-qem.img into the deps list

if it exists. Fix master-without-vendor sdk_x86-sdk build

Change-Id: I5656e7124d30e71120044cce668c54793f77208a
Merged-In: I5656e7124d30e71120044cce668c54793f77208a
(cherry picked from commit a5085788115663fea0cda588b3b8dba8a9513c95)
1 file changed