Fix function generating GPIO state based vector

The function was too eager shifting stuff around, this change corrects
the problem.

Change-Id: I4c13dbe86cb627835dae05bb74af9867c28e143d
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/1291
Tested-by: build bot (Jenkins)

src/southbridge/intel/bd82x6x/gpio.c

@@ -93,7 +93,6 @@ unsigned get_gpios(const int *gpio_num_array)
 
 	while (bitmask &&
 	       ((gpio = *gpio_num_array++) != -1)) {
-		vector <<= 1;
 		if (get_gpio(gpio))
 			vector |= bitmask;
 		bitmask <<= 1;