media: venus : Addition of support for VIDIOC_TRY_ENCODER_CMD

v4l2 compliance expecting support for vidioc_try_encoder_cmd .

error details : test VIDIOC_(TRY_)ENCODER_CMD: FAIL

Signed-off-by: Viswanath Boma <quic_vboma@quicinc.com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Signed-off-by: Vikash Garodia <quic_vgarodia@quicinc.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>