drm/rockchip: fix coding style and incorrect description

Align with other drivers, tab + 2 space key for description.
and edp/hdmi/dsi can be used on both rk3288 and rk3399.
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1535442295-4007-1-git-send-email-hjc@rock-chips.com

drivers/gpu/drm/rockchip/Kconfig

@@ -23,7 +23,7 @@ config ROCKCHIP_ANALOGIX_DP
 	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Analogix Core DP driver. If you want to enable DP
-	  on RK3288 based SoC, you should selet this option.
+	  on RK3288 or RK3399 based SoC, you should select this option.
 
 config ROCKCHIP_CDN_DP
         bool "Rockchip cdn DP"
@@ -39,16 +39,16 @@ config ROCKCHIP_DW_HDMI
         help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Synopsys DesignWare HDMI driver. If you want to
-	  enable HDMI on RK3288 based SoC, you should selet this
-	  option.
+	  enable HDMI on RK3288 or RK3399 based SoC, you should select
+	  this option.
 
 config ROCKCHIP_DW_MIPI_DSI
 	bool "Rockchip specific extensions for Synopsys DW MIPI DSI"
 	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Synopsys DesignWare HDMI driver. If you want to
-	 enable MIPI DSI on RK3288 based SoC, you should selet this
-	 option.
+	  enable MIPI DSI on RK3288 or RK3399 based SoC, you should
+	  select this option.
 
 config ROCKCHIP_INNO_HDMI
 	bool "Rockchip specific extensions for Innosilicon HDMI"