drm/rockchip: dw_hdmi_qp: Use bit macros for RK3576 regs

For consistency and improved readability, redefine a few RK3576 specific
register configurations by relying on GENMASK() and unshifted values for
color depth and output format. Those are not used at the moment, but
will be needed soon to support the related features.

While at it, drop a few other defines which are unlikely to be ever
required.

Acked-by: Daniel Stone <[e-mail]>
Signed-off-by: Cristian Ciocaltea <[e-mail]>
Signed-off-by: Heiko Stuebner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c

···
 #define RK3576_HDMI_HDCP14_MEM_EN	BIT(15)
 
 #define RK3576_VO0_GRF_SOC_CON8		0x0020
-#define RK3576_COLOR_FORMAT_MASK	(0xf << 4)
-#define RK3576_COLOR_DEPTH_MASK		(0xf << 8)
-#define RK3576_RGB			(0 << 4)
-#define RK3576_YUV422			(0x1 << 4)
-#define RK3576_YUV444			(0x2 << 4)
-#define RK3576_YUV420			(0x3 << 4)
-#define RK3576_8BPC			(0x0 << 8)
-#define RK3576_10BPC			(0x6 << 8)
+#define RK3576_COLOR_DEPTH_MASK		GENMASK(11, 8)
+#define RK3576_8BPC			0x0
+#define RK3576_10BPC			0x6
+#define RK3576_COLOR_FORMAT_MASK	GENMASK(7, 4)
+#define RK3576_RGB			0x9
+#define RK3576_YUV422			0x1
+#define RK3576_YUV444			0x2
+#define RK3576_YUV420			0x3
 #define RK3576_CECIN_MASK		BIT(3)
-
-#define RK3576_VO0_GRF_SOC_CON12	0x0030
-#define RK3576_GRF_OSDA_DLYN		(0xf << 12)
-#define RK3576_GRF_OSDA_DIV		(0x7f << 1)
-#define RK3576_GRF_OSDA_DLY_EN		BIT(0)
 
 #define RK3576_VO0_GRF_SOC_CON14	0x0038
 #define RK3576_I2S_SEL_MASK		BIT(0)