PM / devfreq: rockchip-dfi: Handle LPDDR4X

In the DFI driver LPDDR4X can be handled in the same way as LPDDR4. Add
the missing case.

Link: https://lore.kernel.org/all/[e-mail]/
Reviewed-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Sebastian Reichel <[e-mail]>
Acked-by: Chanwoo Choi <[e-mail]>
Acked-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Sascha Hauer <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/devfreq/event/rockchip-dfi.c

···
 			       dfi_regs + DDRMON_CTRL);
 		break;
 	case ROCKCHIP_DDRTYPE_LPDDR4:
+	case ROCKCHIP_DDRTYPE_LPDDR4X:
 		writel_relaxed(HIWORD_UPDATE(DDRMON_CTRL_LPDDR4, DDRMON_CTRL_DDR_TYPE_MASK),
 			       dfi_regs + DDRMON_CTRL);
 		break;

include/soc/rockchip/rockchip_grf.h

···
 	ROCKCHIP_DDRTYPE_LPDDR2	= 5,
 	ROCKCHIP_DDRTYPE_LPDDR3	= 6,
 	ROCKCHIP_DDRTYPE_LPDDR4	= 7,
+	ROCKCHIP_DDRTYPE_LPDDR4X = 8,
 };
 
 #endif /* __SOC_ROCKCHIP_GRF_H */