video: driver: implement module remove function

Implement remove function to unregister video device,
unregister v4l2 device, remove sysfs group, deinit
irq, platform, dt, core.

Change-Id: Ib713b0b66500aafcfb5f0500b9ce7285b9640311
Signed-off-by: Darshana Patil <darshana@codeaurora.org>

driver/platform/waipio/inc/msm_vidc_waipio.h

@@ -9,5 +9,6 @@
 #include "msm_vidc_core.h"
 
 int msm_vidc_init_platform_waipio(struct msm_vidc_core *core);
+int msm_vidc_deinit_platform_waipio(struct msm_vidc_core *core);
 
 #endif // _MSM_VIDC_WAIPIO_H_

driver/platform/waipio/src/msm_vidc_waipio.c

@@ -354,3 +354,9 @@ int msm_vidc_init_platform_waipio(struct msm_vidc_core *core)
 
 	return 0;
 }
+
+int msm_vidc_deinit_platform_waipio(struct msm_vidc_core *core)
+{
+	/* do nothing */
+	return 0;
+}