boot: Rename Android-boot text

Phrases like 'Enable support for' are pointless since this is an option
which enables things. Drop that part so it is easier to follow.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/boot/Kconfig b/boot/Kconfig
index f8b8d60..017f711 100644
--- a/boot/Kconfig
+++ b/boot/Kconfig
@@ -3,7 +3,7 @@
 menu "Boot images"
 
 config ANDROID_BOOT_IMAGE
-	bool "Enable support for Android Boot Images"
+	bool "Android Boot Images"
 	default y if FASTBOOT
 	help
 	  This enables support for booting images which use the Android