tpm: fix header for modular build

Fix build for TCG_TPM=m.  Header file doesn't handle this
and incorrectly builds stubs.

drivers/char/tpm/tpm.c:720: error: redefinition of 'tpm_pcr_read'
include/linux/tpm.h:35: error:previous definition of 'tpm_pcr_read' was here
drivers/char/tpm/tpm.c:752: error: redefinition of 'tpm_pcr_extend'
include/linux/tpm.h:38: error:previous definition of 'tpm_pcr_extend' was here

Repairs linux-next's

commit d6ba452
Author: Mimi Zohar <[email protected]>
Date:   Mon Oct 26 09:26:18 2009 -0400

    tpm add default function definitions

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Rajiv Andrade <[email protected]>
Cc: Mimi Zohar <[email protected]>
Cc: James Morris <[email protected]>
Cc: Eric Paris <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: James Morris <[email protected]>

include/linux/tpm.h

@@ -27,7 +27,7 @@
  */
 #define	TPM_ANY_NUM 0xFFFF
 
-#if defined(CONFIG_TCG_TPM)
+#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
 
 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);