mini-os: tpm: remove usage of inline keyword

mini-os: tpm: remove usage of inline keyword

Compilation fails with gcc-4.3:

tpmback.c: In function 'tpmback_resp':
tpmback.c:148: error: inlining failed in call to 'tpmdev_check_req': call is unlikely and code size would grow
tpmback.c:165: error: called from here
tpmback.c: In function 'new_tpmif':
tpmback.c:384: error: inlining failed in call to '__init_tpmif': call is unlikely and code size would grow
tpmback.c:425: error: called from here

Adjust code to use static instead of inline, it has the same effect.
Change also tpmif_req_ready and tpmif_req_finished before they start to
cause failures.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>