pcrextend: automatically measure SMBIOS product ID at boot

Now that PCRs are not that expensive anymore, let's use them to measure
the SMBIOS product ID to one.

src/tpm2-setup/meson.build

@@ -35,7 +35,7 @@ executables += [
 ]
 
 if conf.get('ENABLE_BOOTLOADER') == 1 and conf.get('HAVE_OPENSSL') == 1 and conf.get('HAVE_TPM2') == 1
-        nvpcrs = []
+        nvpcrs = [ 'hardware' ]
         foreach n : nvpcrs
                 custom_target(
                         input : 'nvpcr/' + n + '.nvpcr.in',

src/tpm2-setup/nvpcr/hardware.nvpcr.in

@@ -0,0 +1,5 @@
+{
+    "name" : "hardware",
+    "algorithm" : "sha256",
+    "nvIndex" : {{TPM2_NVPCR_BASE + 0}}
+}