arm: Remove zmx25 board and ARCH_MX25

This board has not been converted to CONFIG_DM by the deadline.
Remove it.  As this is the last ARCH_MX25 platform, remove those
references as well.

Cc: Matthias Weisser <weisserm@arcor.de>
Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/w1/Kconfig b/drivers/w1/Kconfig
index a2c5108..0ffc1b6 100644
--- a/drivers/w1/Kconfig
+++ b/drivers/w1/Kconfig
@@ -20,7 +20,7 @@
 
 config W1_MXC
 	bool "Enable 1-wire controller on i.MX processors"
-	depends on ARCH_MX25 || ARCH_MX31 || ARCH_MX5
+	depends on ARCH_MX31 || ARCH_MX5
 	help
 	  Support the one wire controller found in some members of the NXP
 	  i.MX SoC family.