soc/amd/picasso/aoac: make aoac_devs array unsigned

The numbers in the array are unsigned, so use an unsigned type there.

Change-Id: I9a85594de0e4c53db965ab84239f19eb46432348
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48180
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/picasso/aoac.c

@@ -21,7 +21,7 @@
  * waiting for each device to become available, a single delay will be
  * executed.  The console UART is handled separately from this table.
  */
-const static int aoac_devs[] = {
+const static unsigned int aoac_devs[] = {
 	FCH_AOAC_DEV_AMBA,
 	FCH_AOAC_DEV_I2C2,
 	FCH_AOAC_DEV_I2C3,