mb/google/sarien: Disable eSPI when ACPI is enabled

Select the option to disable eSPI when ACPI is enabled so the EC
is unable to assert an SMI when booted into the OS.  There is a
kernel driver that implements the same mailbox interface so it
cannot also be used by the SMI handler.

Change-Id: I8bafc749f22aed5595e19e773762ee8b038950b9
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/29536
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/sarien/Kconfig

@@ -15,6 +15,7 @@ config BOARD_GOOGLE_BASEBOARD_SARIEN
 	select MAINBOARD_HAS_TPM2
 	select SOC_INTEL_COFFEELAKE
 	select SOC_INTEL_CANNONLAKE_MEMCFG_INIT
+	select SOC_INTEL_COMMON_BLOCK_SMM_ESPI_ACPI_DIS
 	select SPD_READ_BY_WORD
 	select SYSTEM_TYPE_LAPTOP
 	select TPM2