mb/google/poppy: Add option to disable TPM

Disable TPM when VBOOT_MOCK_SECDATA is enabled.

BUG=None
BRANCH=None
TEST= Build image using USE="mocktpm" emerge-poppy coreboot depthcharge
vboot_reference chromeos-bootimage . Verify boot is successful with mock
tpm.

Change-Id: Iee527ed17cffb7d25d9089e48a194d99ac8c3cd1
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Reviewed-on: https://review.coreboot.org/20158
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/poppy/Kconfig

@@ -15,7 +15,7 @@ config BOARD_GOOGLE_BASEBOARD_POPPY
 	select MAINBOARD_HAS_CHROMEOS
 	select MAINBOARD_USES_FSP2_0
 	select NO_FADT_8042
-	select POPPY_USE_I2C_TPM
+	select POPPY_USE_I2C_TPM if !VBOOT_MOCK_SECDATA
 	select SOC_INTEL_KABYLAKE
 
 if BOARD_GOOGLE_BASEBOARD_POPPY