Do not override CONFIG_MOCK_TMP setting in the vboot Makefile

With the upcoming modification of the ebuild, there is no need to have
the Makefile pay attention to the MOCK_TPM environment setting: the
config file contents will be suffucient.

CQ-DEPEND=CL:184441
BUG=none
TEST=manual
    $ FEATURES=noclean emerge-rambi depthcharge
    $ (cd  /build/rambi/tmp/portage/sys-boot/depthcharge-9999/work; find -name '*mock*.o')
    $ USE=mocktpm FEATURES=noclean emerge-rambi depthcharge
    $ (cd  /build/rambi/tmp/portage/sys-boot/depthcharge-9999/work; find -name '*mock*.o')
    ./depthcharge-9999/build/external/vboot/firmware/lib/mocked_rollback_index.o
    ./depthcharge-9999/build/external/vboot/firmware/lib/mocked_tpm_bootmode.o
    ./depthcharge-9999/build/external/vboot/firmware/lib/tpm_lite/mocked_tlcl.o
    $

Change-Id: I2c771a0434011dd5b0efdbee26f01a03efc67cf1
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/184466
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Gabe Black <gabeblack@chromium.org>
1 file changed