tpm: Fix compilation warning when CONFIG_PNP is not defined
The is_itpm() function is only accessed from a block surrounded by
#ifdef CONFIG_PNP. Therefore, also surround it with #ifdef CONFIG_PNP
and remove the #else branch causing the warning.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Reported-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: James Morris <jmorris@namei.org>