mainboard/google/kahlee: Add mainboard resume function

Add the mainboard resume function and __weak variant override.

Change-Id: I808734208bd1ce81428771ea203709b53db56cd3
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/27486
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/google/kahlee/mainboard.c

@@ -190,18 +190,31 @@ int mainboard_get_ehci_oc_map(uint16_t *map)
 	return variant_get_ehci_oc_map(map);
 }
 
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
+void mainboard_suspend_resume(void)
+{
+	variant_mainboard_suspend_resume();
+}
+#endif
+
 struct chip_operations mainboard_ops = {
 	.init = mainboard_init,
 	.enable_dev = kahlee_enable,
 	.final = mainboard_final,
 };
 
-/* Variants may override this function so see definitions in variants/ */
+/* Variants may override these functions so see definitions in variants/ */
 uint8_t __weak variant_board_sku(void)
 {
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
+void __weak variant_mainboard_suspend_resume(void)
+{
+}
+#endif
+
 const char *smbios_mainboard_sku(void)
 {
 	static char sku_str[7]; /* sku{0..255} */

src/mainboard/google/kahlee/variants/baseboard/include/baseboard/variants.h

@@ -30,5 +30,8 @@ int variant_get_ehci_oc_map(uint16_t *usb_oc_map);
 const struct soc_amd_gpio *variant_early_gpio_table(size_t *size);
 const struct soc_amd_gpio *variant_gpio_table(size_t *size);
 void variant_romstage_entry(int s3_resume);
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
+void variant_mainboard_suspend_resume(void);
+#endif
 
 #endif /* __BASEBOARD_VARIANTS_H__ */