defconfig: msm8974: Disable bayer camera drivers

This change is required to disable the S5K3L1YX,
IMX135, IMX132, OV2720 image sensor drivers
compilation for msm8974 based platforms.

In current camera implementation we need to prevent twice
creating of kernel video nodes because this is already
done in "generic" sensor driver.

Change-Id: Ic763647476a114135b8df03a5ab9f5927ad3bb8a
Signed-off-by: Evgeniy Borisov <eborisov@codeaurora.org>