google/poppy: select NO_FADT_8042

Poppy doesn't support 8042 keyboard. Select
NO_FADT_8042 to disable 8042 in FADT header.
Kernel will not try to access 8042 region
if 8042.FADT=0

BUG=chrome-os-partner:61858
TEST=Boot OS and verify FADT 8042 flag

Change-Id: I00182eb4b059d4d9f0705d349dc98651e3955f0d
Signed-off-by: Jenny TC <jenny.tc@intel.com>
Reviewed-on: https://review.coreboot.org/18311
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/poppy/Kconfig

@@ -11,6 +11,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_HAS_CHROMEOS
 	select MAINBOARD_USES_FSP2_0
 	select SOC_INTEL_SKYLAKE
+	select NO_FADT_8042
 
 config CHROMEOS
 	select EC_GOOGLE_CHROMEEC_SWITCHES