video: driver: access buffers list under lock only

Do not access buffers list of an instance without
acquiring its instance lock in msm_vidc_set_clocks()
and msm_vidc_set_buses().

Change-Id: Ic7e8e15eaddca3b77bd4eccc6b728de20d3bcc78
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>

driver/vidc/inc/msm_vidc_inst.h

@@ -140,6 +140,7 @@ struct msm_vidc_inst {
 	bool                               active;
 	u64                                last_qbuf_time_ns;
 	bool                               vb2q_init;
+	u32                                max_input_data_size;
 };
 
 #endif // _MSM_VIDC_INST_H_