soc/amd/cezanne: Add call to mb to configure eSPI requirements

When initializing espi early, there may be mainboard requirements to
configure the bus properly.  This allows the mainboard to do that.

BUG=192100564
TEST=Build along with next patch, eSPI works on guybrush

Change-Id: Icc02877a09b8f8ed20fd1b04f3cee0509f1a85c5
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55863
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nikolai Vyssotski <nikolai.vyssotski@amd.corp-partner.google.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
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 b724408..e698c8c 100644
--- a/src/soc/amd/common/block/lpc/espi_util.c
+++ b/src/soc/amd/common/block/lpc/espi_util.c
@@ -17,6 +17,10 @@
 	espi_bar = bar;
 }
 
+__weak void mb_set_up_early_espi(void)
+{
+}
+
 static uintptr_t espi_get_bar(void)
 {
 	if (ENV_X86 && !espi_bar)