ANDROID: remove CONFIG_IOSCHED_BFQ from gki_defconfig

Commit 1444fed2 ("mmc: core: Imply IOSCHED_BFQ") adds an implicit
dependency on IOSCHED_BFQ which makes it always enabled in the Android
gki_defconfig files, so it needs to be explicitly removed, otherwise the
build fails.

Fixes: 1444fed2 ("mmc: core: Imply IOSCHED_BFQ")
Change-Id: Iea061f0d2f47399baad2274def0f48e5407d38d8
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>