tpm: add #ifndef to fix redeclaration build errors

tpm_tis_spi.c directly includes tpm_tis.h and tpm-v2.h which both
define the same enums (see e.g. TPM_ACCESS_VALID). Add an #ifndef to
prevent redeclaration errors.
Signed-off-by: NJohannes Holland <johannes.holland@infineon.com>

drivers/tpm/tpm_tis.h

@@ -104,6 +104,7 @@ struct tpm_cmd_t {
 /* Max number of iterations after i2c NAK */
 #define MAX_COUNT		3
 
+#ifndef __TPM_V2_H
 /*
  * Max number of iterations after i2c NAK for 'long' commands
  *
@@ -127,5 +128,6 @@ enum tis_status {
 	TPM_STS_DATA_AVAIL		= 0x10,
 	TPM_STS_DATA_EXPECT		= 0x08,
 };
+#endif
 
 #endif