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>

src/soc/amd/cezanne/early_fch.c

@@ -35,6 +35,7 @@ static void reset_i2c_peripherals(void)
 /* Initialize port80h routing early if needed */
 void configure_port80_routing_early(void)
 {
+	mb_set_up_early_espi();
 	if (CONFIG(SOC_AMD_COMMON_BLOCK_USE_ESPI))
 		espi_setup();
 }

src/soc/amd/common/block/include/amdblocks/espi.h

@@ -128,4 +128,7 @@ void espi_update_static_bar(uintptr_t bar);
  */
 int espi_setup(void);
 
+/* Run mainboard configuration needed to set up eSPI */
+void mb_set_up_early_espi(void);
+
 #endif /* AMD_BLOCK_ESPI_H */

src/soc/amd/common/block/lpc/espi_util.c

@@ -17,6 +17,10 @@ void espi_update_static_bar(uintptr_t bar)
 	espi_bar = bar;
 }
 
+__weak void mb_set_up_early_espi(void)
+{
+}
+
 static uintptr_t espi_get_bar(void)
 {
 	if (ENV_X86 && !espi_bar)