Blackfin arch: fix bug - kernel crash after config IP for ethernet port

Fix typo - kernel crash on bf533-stamp/bf533-ezkit after config IP for ethernet port
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/mach-bf533/include/mach/gpio.h

@@ -10,7 +10,7 @@
 #ifndef _MACH_GPIO_H_
 #define _MACH_GPIO_H_
 
-#define MAX_BLACKFIN_GPIOS 48
+#define MAX_BLACKFIN_GPIOS 16
 
 #define	GPIO_PF0	0
 #define	GPIO_PF1	1