grunt: Wire up the EC SMI handler

This won't actually get called yet since the GPIO pin has not been
configured as SMI.

BUG=b:80295434
TEST=grunt: Made sure events could be processed.

Change-Id: I189e26196e4543b3e34bff5d9df8566eff07d585
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-on: https://review.coreboot.org/26546
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/kahlee/smihandler.c

@@ -20,6 +20,13 @@
 #include <soc/smi.h>
 #include <variant/ec.h>
 
+void mainboard_smi_gpi(u32 gpi_sts)
+{
+	if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC))
+		if (gpi_sts & (1 << EC_SMI_GPI))
+			chromeec_smi_process_events();
+}
+
 void mainboard_smi_sleep(u8 slp_typ)
 {
 	if (IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC))

src/soc/amd/common/block/acpi/Makefile.inc

@@ -1 +1,2 @@
 ramstage-y += halt.c
+smm-y += halt.c