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>
diff --git a/arch/mips/alchemy/devboards/Makefile b/arch/mips/alchemy/devboards/Makefile
index cfda972..c74ef80 100644
--- a/arch/mips/alchemy/devboards/Makefile
+++ b/arch/mips/alchemy/devboards/Makefile
@@ -16,3 +16,5 @@
 obj-$(CONFIG_MIPS_DB1550)	+= db1x00/
 obj-$(CONFIG_MIPS_BOSPORUS)	+= db1x00/
 obj-$(CONFIG_MIPS_MIRAGE)	+= db1x00/
+
+EXTRA_CFLAGS += -Werror
diff --git a/arch/mips/alchemy/xxs1500/Makefile b/arch/mips/alchemy/xxs1500/Makefile
index 68671c2..4dc81d7 100644
--- a/arch/mips/alchemy/xxs1500/Makefile
+++ b/arch/mips/alchemy/xxs1500/Makefile
@@ -6,3 +6,5 @@
 #
 
 lib-y := init.o board_setup.o platform.o
+
+EXTRA_CFLAGS += -Werror