Convert CONFIG_VIDEO_SW_CURSOR to Kconfig

This converts the following to Kconfig:
   CONFIG_VIDEO_SW_CURSOR

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
[trini: Re-convert, find all the cases where this is off]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ea20_defconfig b/configs/ea20_defconfig
index 0aae79b..6a72555 100644
--- a/configs/ea20_defconfig
+++ b/configs/ea20_defconfig
@@ -25,3 +25,4 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SYS_NS16550=y
+# CONFIG_VIDEO_SW_CURSOR is not set