[msm7630]: Add code to scan limited number of keys of Qwerty keypad.

Add code to scan only the common keys present on all the different
varients of msm7630 target. This fixes the issue of device not going
into fastboot when miniSD card is present in a Fluid device.

CRs-fixed: 225917
diff --git a/target/msm7630_surf/keypad.c b/target/msm7630_surf/keypad.c
index 36a6e42..c7181dc 100644
--- a/target/msm7630_surf/keypad.c
+++ b/target/msm7630_surf/keypad.c
@@ -36,10 +36,8 @@
 #define ARRAY_SIZE(x) (sizeof(x)/sizeof((x)[0]))
 #define BITS_IN_ELEMENT(x) (sizeof(x)[0] * 8)
 
-static unsigned char qwerty_keys_old[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-					   0x00, 0x00, 0x00, 0x00, 0x00};
-static unsigned char qwerty_keys_new[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-					   0x00, 0x00, 0x00, 0x00, 0x00};
+static unsigned char qwerty_keys_old[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+static unsigned char qwerty_keys_new[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 
 #define KEYMAP_INDEX(row, col) (row)* BITS_IN_ELEMENT(qwerty_keys_new) + (col)