Convert CONFIG_ATMEL_HLCD to Kconfig

This converts the following to Kconfig:
   CONFIG_ATMEL_HLCD

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/at91sam9n12ek_spiflash_defconfig b/configs/at91sam9n12ek_spiflash_defconfig
index 688f0c3..0e95cff 100644
--- a/configs/at91sam9n12ek_spiflash_defconfig
+++ b/configs/at91sam9n12ek_spiflash_defconfig
@@ -63,4 +63,5 @@
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
+CONFIG_ATMEL_HLCD=y
 CONFIG_LCD=y