linux: enable CR50 TPM found on chromebooks

Along with other ChromeOS related configs, this change
enables TPM support for Chromebook/Chromebox devices.

pkgs/os-specific/linux/kernel/common-config.nix

@@ -1024,6 +1024,8 @@ let
       CROS_EC_ISHTP = module;
 
       CROS_KBD_LED_BACKLIGHT = module;
+
+      TCG_TIS_SPI_CR50 = whenAtLeast "5.5" yes;
     } // optionalAttrs (versionAtLeast version "5.4" && stdenv.hostPlatform.system == "x86_64-linux") {
       CHROMEOS_LAPTOP = module;
       CHROMEOS_PSTORE = module;