arm: Remove mx35pdk board

This board has not been converted to CONFIG_DM_MMC by the deadline of
v2019.04, which is almost two years ago.  In addition there are other DM
migrations it is also missing.  Remove it.

Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 9db4cae..79ad0a1 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 || TARGET_MX35PDK \
+	depends on ARCH_MX25 || ARCH_MX31 || TARGET_APF27 || TARGET_FLEA3 \
 		|| MX5 || MX6 || MX7 || IMX8M
 	help
 	  If you have a machine based on a Motorola IMX CPU you