drm/amd/display: add SW_USE_I2C_REG request.

[Description]
This is for DC_I2c arbitration use between HW use/SW use and DMCU use.
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -306,6 +306,8 @@ static bool setup_engine(
 #if defined(CONFIG_DRM_AMD_DC_DCN2_0)
 	uint32_t  reset_length = 0;
 #endif
+	/* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/
+	REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1);
 
 	/* we have checked I2c not used by DMCU, set SW use I2C REQ to 1 to indicate SW using it*/
 	REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_USE_I2C_REG_REQ, 1);