video: Kconfig: spelling fixes

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/video/rockchip/Kconfig b/drivers/video/rockchip/Kconfig
index b1d7c62..10182d0 100644
--- a/drivers/video/rockchip/Kconfig
+++ b/drivers/video/rockchip/Kconfig
@@ -65,6 +65,6 @@
 	help
 	  This enables Mobile Industry Processor Interface(MIPI) display
 	  support. The mipi controller and dphy on rk3288& rk3399 support
-	  16,18, 24 bits per pixel with upto 2k resolution ratio.
+	  16,18, 24 bits per pixel with up to 2k resolution ratio.
 
 endif