arm: Remove apf27 board

This board has not been converted to CONFIG_DM_MMC by the deadline.
Remove it.

Cc: Philippe Reynes <tremyfr@yahoo.fr>
Cc: Eric Jarrige <eric.jarrige@armadeus.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 24413d1..af83e96 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -635,7 +635,7 @@
 
 config MXC_UART
 	bool "IMX serial port support"
-	depends on ARCH_MX25 || ARCH_MX31 || TARGET_APF27 || TARGET_FLEA3 \
+	depends on ARCH_MX25 || ARCH_MX31 || TARGET_FLEA3 \
 		|| MX5 || MX6 || MX7 || IMX8M
 	help
 	  If you have a machine based on a Motorola IMX CPU you