video-driver: Move register manipulation functions

Move register manipulation functions in a common variant
file (msm_vidc_variant).

Change-Id: Ic92a264b47b4d90efcfb4389e30d2749a23f792b
Signed-off-by: Stanimir Varbanov <quic_c_svarba@quicinc.com>

driver/vidc/inc/resources.h

@@ -26,8 +26,6 @@ struct msm_vidc_resources_ops {
 
 	int (*clk_disable)(struct msm_vidc_core *core, const char *name);
 	int (*clk_enable)(struct msm_vidc_core *core, const char *name);
-
-	int (*set_regs)(struct msm_vidc_core *core);
 };
 
 const struct msm_vidc_resources_ops *get_resources_ops(void);