drm/rockchip: vop2: rename grf to sys_grf

The vop2 need to reference more grf(system grf, vop grf, vo0/1 grf,etc)
in the upcoming rk3588.

So we rename the current system grf to sys_grf.

Signed-off-by: Andy Yan <[e-mail]>
Reviewed-by: Sascha Hauer <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

···
 	void __iomem *regs;
 	struct regmap *map;
 
-	struct regmap *grf;
+	struct regmap *sys_grf;
 
 	/* physical map length of vop2 register */
 	u32 len;
···
 		dip &= ~RK3568_DSP_IF_POL__RGB_LVDS_PIN_POL;
 		dip |= FIELD_PREP(RK3568_DSP_IF_POL__RGB_LVDS_PIN_POL, polflags);
 		if (polflags & POLFLAG_DCLK_INV)
-			regmap_write(vop2->grf, RK3568_GRF_VO_CON1, BIT(3 + 16) | BIT(3));
+			regmap_write(vop2->sys_grf, RK3568_GRF_VO_CON1, BIT(3 + 16) | BIT(3));
 		else
-			regmap_write(vop2->grf, RK3568_GRF_VO_CON1, BIT(3 + 16));
+			regmap_write(vop2->sys_grf, RK3568_GRF_VO_CON1, BIT(3 + 16));
 		break;
 	case ROCKCHIP_VOP2_EP_HDMI0:
 		die &= ~RK3568_SYS_DSP_INFACE_EN_HDMI_MUX;
···
 			return PTR_ERR(vop2->lut_regs);
 	}
 
-	vop2->grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
+	vop2->sys_grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
 
 	vop2->hclk = devm_clk_get(vop2->dev, "hclk");
 	if (IS_ERR(vop2->hclk)) {