Blackfin arch: add BF54x missing GPIO access functions

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/include/asm-blackfin/mach-bf548/gpio.h b/include/asm-blackfin/mach-bf548/gpio.h
index 4528942..8c5847a 100644
--- a/include/asm-blackfin/mach-bf548/gpio.h
+++ b/include/asm-blackfin/mach-bf548/gpio.h
@@ -187,8 +187,8 @@
 #define GPIO_PJ11	155
 #define GPIO_PJ12	156
 #define GPIO_PJ13	157
-#define GPIO_PJ14	158
-#define GPIO_PJ15	159
+#define GPIO_PJ14	158	/* N/A */
+#define GPIO_PJ15	159	/* N/A */
 
 #define MAX_BLACKFIN_GPIOS 160