common: fix tpm_task prototype
common: fix tpm_task prototype

The actual main task function prototype includes a void pointer as a
parameter. Enabling link time optimization shows that tpm_task()
prototype is not compliant, let's fix it.

BRANCH=cr50, cr50-mp
BUG=b:65253310
TEST=building Cr50 with CONFIG_LTO enabled does not fail any more.

Change-Id: Ia5ca961ced6cbef66894a52b25b711f8a2317244
Signed-off-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1450814
Reviewed-by: Andrey Pronin <53bbebe6910b11f7aa2d1daaa466658eb4cba5f2@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec