tpm: move TPM_DIGEST_SIZE defintion

IMA requires access to TPM_DIGEST_SIZE definition.  This patch
moves the definition to <linux/tpm.h>.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>

drivers/char/tpm/tpm.h

@@ -272,7 +272,6 @@ typedef union {
 	struct	tpm_output_header out;
 } tpm_cmd_header;
 
-#define TPM_DIGEST_SIZE 20
 struct tpm_pcrread_out {
 	u8	pcr_result[TPM_DIGEST_SIZE];
 } __packed;

include/linux/tpm.h

@@ -22,6 +22,8 @@
 #ifndef __LINUX_TPM_H__
 #define __LINUX_TPM_H__
 
+#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
+
 /*
  * Chip num is this value or a valid tpm idx
  */