ssbi: Cleanup ssbi dependency from gpio_keypad

SSBI declarations were in the gpio_keypad files
resulting in needing to add gpio_keypad to use
ssbi for pmic functions.

Change-Id: Ic62a499a3cbd5fab9b8235e469b93103d207b20e
diff --git a/target/msm8960/keypad.c b/target/msm8960/keypad.c
index 4ad9495..5cc0b87 100755
--- a/target/msm8960/keypad.c
+++ b/target/msm8960/keypad.c
@@ -29,6 +29,7 @@
 
 #include <string.h>
 #include <dev/keys.h>
+#include <dev/ssbi.h>
 #include <dev/gpio_keypad.h>
 
 #define NUM_OF_ROWS 1