lib/tlcl: Provide mock implementation

It returns TPM_E_NO_DEVICE for all calls.

BRANCH=None
BUG=None
TEST=manual MOCK_TPM=1 emerge-foster coreboot, and
     coreboot can boot to kernel

Change-Id: Id7e79b58fabeac929b874385064b2417db49a708
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: a9a91a65af115657e7317754eda931120750c56d
Original-Signed-off-by: Yen Lin <yelin@nvidia.com>
Original-Change-Id: I8dcf0db14cf2bc76c67a3bd7f06114e70e08764d
Original-Reviewed-on: https://chromium-review.googlesource.com/264946
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9983
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/lib/Makefile.inc

@@ -35,7 +35,13 @@ verstage-y += cbfs.c
 verstage-y += memcmp.c
 verstage-$(CONFIG_CONSOLE_CBMEM) += cbmem_console.c
 verstage-$(CONFIG_COMMON_CBFS_SPI_WRAPPER) += cbfs_spi.c
+
+ifeq ($(MOCK_TPM),1)
+verstage-y += mocked_tlcl.c
+else
 verstage-y += tlcl.c
+endif
+
 verstage-$(CONFIG_GENERIC_UDELAY) += timer.c
 verstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c