soc/amd/stoneyridge: Fix gpio_set function

The gpio_set function was not writing the correct GPIO register
address.

Change-Id: Ib306773ac72505977b606836bbaf3e2067324894
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/27484
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/amd/stoneyridge/gpio.c

@@ -162,7 +162,7 @@ void gpio_set(gpio_t gpio_num, int value)
 	reg = read32((void *)gpio_address);
 	reg &= ~GPIO_OUTPUT_MASK;
 	reg |=  !!value << GPIO_OUTPUT_SHIFT;
-	write32((void *)(uintptr_t)gpio_num, reg);
+	write32((void *)(uintptr_t)gpio_address, reg);
 }
 
 void gpio_input_pulldown(gpio_t gpio_num)