soc/amd/picasso: factor out AOAC offset defines

Factoring out those defines allows using them easily in the ACPI code
without having to use preprocessor macros.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I99cb03de8782a0eeeb505f567b982099b0e8a18d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55531
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/soc/amd/picasso/uart.c

@@ -7,6 +7,7 @@
 #include <amdblocks/gpio_banks.h>
 #include <amdblocks/aoac.h>
 #include <amdblocks/uart.h>
+#include <soc/aoac_defs.h>
 #include <soc/southbridge.h>
 #include <soc/gpio.h>
 #include <soc/uart.h>