ARM: rpi: increase CONFIG_SYS_MAXARGS

This allows all the hush tests implemented in test/py to pass, under qemu
at least.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/rpi-common.h

@@ -118,7 +118,7 @@
 #define CONFIG_PREBOOT			"usb start"
 
 /* Shell */
-#define CONFIG_SYS_MAXARGS		8
+#define CONFIG_SYS_MAXARGS		16
 #define CONFIG_COMMAND_HISTORY
 
 /* Commands */