hw/tpm: Include missing 'qemu/option.h' header

Files using the TPM_STANDARD_CMDLINE_OPTS macro declared in
"tpm_int.h" will use QEMU_OPT_STRING definition declared in
"qemu/option.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Message-id: 20200612085444.8362-6-philmd@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

hw/tpm/tpm_int.h

@@ -12,6 +12,8 @@
 #ifndef TPM_TPM_INT_H
 #define TPM_TPM_INT_H
 
+#include "qemu/option.h"
+
 #define TPM_STANDARD_CMDLINE_OPTS \
     { \
         .name = "type", \