MIPS: Alchemy: Turn on -Werror for devboards and xss1500

Warnings being suppressed, we can now turn on -Werror for boards which did
not have it already (devboards and xss1500).
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/alchemy/devboards/Makefile

@@ -16,3 +16,5 @@ obj-$(CONFIG_MIPS_DB1500)	+= db1x00/
 obj-$(CONFIG_MIPS_DB1550)	+= db1x00/
 obj-$(CONFIG_MIPS_BOSPORUS)	+= db1x00/
 obj-$(CONFIG_MIPS_MIRAGE)	+= db1x00/
+
+EXTRA_CFLAGS += -Werror

arch/mips/alchemy/xxs1500/Makefile

@@ -6,3 +6,5 @@
 #
 
 lib-y := init.o board_setup.o platform.o
+
+EXTRA_CFLAGS += -Werror