Blackfin arch: fix bug can not wakeup from sleep via push buttons

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

diff --git a/include/asm-blackfin/gpio.h b/include/asm-blackfin/gpio.h
index aa0d550..d98d77a 100644
--- a/include/asm-blackfin/gpio.h
+++ b/include/asm-blackfin/gpio.h
@@ -332,6 +332,7 @@
 	unsigned short inen;
 
 	unsigned short fer;
+	unsigned short reserved;
 };
 #endif /*CONFIG_PM*/