soc/amd/common/blocks/lpc: Remove common SPI registers

Use the SoC versions instead.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ia0b8129b165f8a2e6be6706ab2e3f2d39e1025a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50446
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/stoneyridge/southbridge.c

@@ -26,6 +26,7 @@
 #include <soc/pci_devs.h>
 #include <agesa_headers.h>
 #include <soc/acpi.h>
+#include <soc/lpc.h>
 #include <soc/nvs.h>
 #include <types.h>