ANDROID: gki_defconfig: Enable MEDIA_SUPPORT_FILTER

Since commit c6774ee0 ("media: Kconfig: make filtering devices
optional"), a lot of options default to =y or =m if MEDIA_SUPPORT_FILTER
is not set. For instance, the current gki_defconfig builds a lot of
media tuner drivers as modules, without explicitly mentioning them. As
such, all these risk to be mistaken as GKI modules, even though we really
don't care.

Enable MEDIA_SUPPORT_FILTER to revert to the defaults we had in previous
android kernels.

Bug: 158655966
Signed-off-by: Quentin Perret <qperret@google.com>
Change-Id: I0f4ae305f43f88736d0a94bdf006f33aad7cf5c4