video: driver: add core sub_state support

Introduce core->sub_state similar to inst->sub_state.

[1] pm_suspended - moved to this substate in case of PM suspend
[2] handoff - moved to this state after successful
    handoff_regulator call.
[3] fw_power_control - moved to this state in case of IFPC.
[4] power_enable - will track core power_on/power_off status.
[5] page_fault - used to rate_limit fault logs.
[6] cpu_wd - indicates hw fired wd interrupt.
[7] video_unresponsive - moved to this state if sync cmd fails.

Change-Id: Iceb65cf404fd93aff7846860b0276307e4eab570
Signed-off-by: Govindaraj Rajagopal <quic_grajagop@quicinc.com>

driver/vidc/inc/venus_hfi.h

@@ -73,6 +73,5 @@ irqreturn_t venus_hfi_isr(int irq, void *data);
 irqreturn_t venus_hfi_isr_handler(int irq, void *data);
 
 int __prepare_pc(struct msm_vidc_core *core);
-bool __core_in_valid_state(struct msm_vidc_core *core);
 
 #endif // _VENUS_HFI_H_