soc/amd/common: move configure_espi_with_mb_hook implementation

Move the actual implementation of configure_espi_with_mb_hook out of the
header file and into the espi_util.c file.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I1106e69a52bf329a41e8e12fd09db846310b102a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58340
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
diff --git a/src/soc/amd/common/block/lpc/espi_util.c b/src/soc/amd/common/block/lpc/espi_util.c
index ebc8f45..4eb700b 100644
--- a/src/soc/amd/common/block/lpc/espi_util.c
+++ b/src/soc/amd/common/block/lpc/espi_util.c
@@ -1053,3 +1053,10 @@
 
 	return 0;
 }
+
+/* Setup eSPI with any mainboard specific initialization. */
+void configure_espi_with_mb_hook(void)
+{
+	mb_set_up_early_espi();
+	espi_setup();
+}