FROMGIT: media: venus: hfi: add a check to handle OOB in sfr region

sfr->buf_size is in shared memory and can be modified by malicious user.
OOB write is possible when the size is made higher than actual sfr data
buffer. Cap the size to allocated size for such cases.

Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>

(cherry picked from commit f4b21171 https://gitlab.freedesktop.org/linux-media/media-committers.git

 master)
Change-Id: I483a5feff3dfa35dae8f444e57601d2d1d85246f
Signed-off-by: Gaviraju Doddabettahalli Bettegowda <quic_gdoddabe@quicinc.com>