soc/amd/picasso/uart: add missing device/device.h include

Change-Id: Ie3188d36e8ecacab42818c8619122751fcb7cdf8
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49379
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/uart.c

@@ -3,6 +3,7 @@
 #include <acpi/acpigen.h>
 #include <console/console.h>
 #include <commonlib/helpers.h>
+#include <device/device.h>
 #include <device/mmio.h>
 #include <amdblocks/gpio_banks.h>
 #include <amdblocks/aoac.h>