Revert "mm-video-v4l2: Protect buffer access and increase input buffer size"

This reverts commit eaa23dde.

Reason for revert: regression at oc-mr1/bullhead

Change-Id: I9db2e2592600137151d0e3f86f6b6dc2f03a950d
Bug: 64340487
Bug: 78291359
Bug: 78913375
Merged-In: Ibd1ed01c7d740553b3cf90b6f3dd2fd447563284
Merged-In: I1763963839375db90f76dd0022bd1767ac5f067d
Merged-In: I69398d4fb236289be5f0b79f8db9a3bc30144b90
Merged-In: Ie9caad90482698913db06cdb9aeebfd869fe1a6a