drm/amd/display: Eliminate i2c hw function pointers

[Why]
The function pointers of the dce_i2c_hw struct were never
accessed from outside dce_i2c_hw.c and had only one version.
As function pointers take up space and make debugging difficult,
and they are not needed in this case, they should be removed.

[How]
Remove the dce_i2c_hw_funcs struct and make static all
functions that were previously a part of it.  Reorder
the functions in dce_i2c_hw.c.
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h

@@ -256,40 +256,11 @@ struct dce_i2c_hw {
 	uint32_t buffer_size;
 	struct dc_context *ctx;
 
-	const struct dce_i2c_hw_funcs *funcs;
 	const struct dce_i2c_registers *regs;
 	const struct dce_i2c_shift *shifts;
 	const struct dce_i2c_mask *masks;
 };
 
-
-struct dce_i2c_hw_funcs {
-	bool (*setup_engine)(
-		struct dce_i2c_hw *dce_i2c_hw);
-	void (*set_speed)(
-		struct dce_i2c_hw *dce_i2c_hw,
-		uint32_t speed);
-	uint32_t (*get_speed)(
-		const struct dce_i2c_hw *dce_i2c_hw);
-	void (*release_engine)(
-		struct dce_i2c_hw *dce_i2c_hw);
-	bool (*process_transaction)(
-		struct dce_i2c_hw *dce_i2c_hw,
-		struct i2c_request_transaction_data *request);
-	void (*process_channel_reply)(
-		struct dce_i2c_hw *dce_i2c_hw,
-		struct i2c_reply_transaction_data *reply);
-	bool (*is_hw_busy)(
-		struct dce_i2c_hw *dce_i2c_hw);
-	enum i2c_channel_operation_result (*get_channel_status)(
-		struct dce_i2c_hw *dce_i2c_hw,
-		uint8_t *returned_bytes);
-	void (*execute_transaction)(
-		struct dce_i2c_hw *dce_i2c_hw);
-	void (*disable_i2c_hw_engine)(
-		struct dce_i2c_hw *dce_i2c_hw);
-};
-
 void dce_i2c_hw_construct(
 	struct dce_i2c_hw *dce_i2c_hw,
 	struct dc_context *ctx,