ANDROID: fix VIDEOBUF2_CORE dependency in 'allmodconfig' builds

Fix missing dependency for CONFIG_VIDEOBUF2_CORE for
'allmodconfig' builds. Since CONFIG_MEDIA_SUPPORT is
always selected, drop it from gki_defconfig

Fixes: 64923894 ("ANDROID: init: GKI: enable hidden configs
for media")

Test: successful 'allmodconfig' build
Change-Id: I1dd5ff154c1aeb90457c23dc233cb32595bd9bed
Signed-off-by: Todd Kjos <tkjos@google.com>