video: driver: implement TRY_FMT for encoder and decoder

Any video device which supports capture multiplanar buf type
should implement VIDIOC_TRY_FMT.

Fixes: v4l2-compliance: testTryFormats (VIDIOC_TRY_FMT).

Change-Id: Id7ec171115c9374c6173fcf74a609382c3acf2d0
Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>

driver/vidc/inc/msm_vdec.h

@@ -14,6 +14,7 @@ int msm_vdec_streamon_input(struct msm_vidc_inst *inst);
 int msm_vdec_streamoff_output(struct msm_vidc_inst *inst);
 int msm_vdec_streamon_output(struct msm_vidc_inst *inst);
 int msm_vdec_qbuf(struct msm_vidc_inst *inst, struct vb2_buffer *vb2);
+int msm_vdec_try_fmt(struct msm_vidc_inst *inst, struct v4l2_format *f);
 int msm_vdec_s_fmt(struct msm_vidc_inst *inst, struct v4l2_format *f);
 int msm_vdec_g_fmt(struct msm_vidc_inst *inst, struct v4l2_format *f);
 int msm_vdec_s_selection(struct msm_vidc_inst* inst, struct v4l2_selection* s);