media/dvb: Allow large non-contiguous buffers to map to shmbrige

One input buffer size defined by OpenMax decoder is 3538944byte and
OpenMax allocates 32 such buffers. Currrently relying on
qseecom_send_command legacy path to avoid whitelisting for securemm TA.

Change-Id: I595f324c8cf33fed188f9ed31136d1447bb30265
Signed-off-by: Murthy Nidadavolu <mnssr@codeaurora.org>