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/variant/common/inc/msm_vidc_variant.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2022, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef _MSM_VIDC_VARIANT_H_
+#define _MSM_VIDC_VARIANT_H_
+
+#include <linux/types.h>
+
+struct msm_vidc_core;
+
+int __write_register_masked(struct msm_vidc_core *core, u32 reg, u32 value,
+			    u32 mask);
+int __write_register(struct msm_vidc_core *core, u32 reg, u32 value);
+int __read_register(struct msm_vidc_core *core, u32 reg, u32 *value);
+int __read_register_with_poll_timeout(struct msm_vidc_core *core, u32 reg,
+				      u32 mask, u32 exp_val, u32 sleep_us,
+				      u32 timeout_us);
+int __set_registers(struct msm_vidc_core *core);
+
+#endif