mb/google/octopus: Configure SMI for ESPI

This patch enables EC SMI when ESPI is enabled.

BUG=b:77857802
TEST= SMI is working in depthcharge.

Change-Id: I52726194b8346488e5ad781e78e33c5d286d132f
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/25569
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/octopus/smihandler.c

@@ -47,3 +47,8 @@ int mainboard_smi_apmc(u8 apmc)
 				MAINBOARD_EC_SMI_EVENTS);
 	return 0;
 }
+
+void mainboard_smi_espi_handler(void)
+{
+	chromeec_smi_process_events();
+}