gbmcweb: Add Redfish BootOption PATCH (BootOptionEnabled)

Adds PATCH /redfish/v1/Systems/<id>/Boot/BootOptions/<ref>/ to enable or
disable a UEFI boot option via SystemRegistry::UpdateBootOptionEnabled.

- Only BootOptionEnabled is patchable; any other property is rejected
  with 400.
- Returns 204 No Content on success, 404 if the boot option does not exist,
  and 500 for any other registry error.

Google-Bug-Id:539554519
PiperOrigin-RevId: 995287646
Change-Id: I55015c4c8c599e2590650c144a4d6a454cd46234

gbmcweb

diff --git a/gbmcweb b/gbmcweb
index 5139d32..dfc02e5 160000
--- a/gbmcweb
+++ b/gbmcweb
@@ -1 +1 @@
-Subproject commit 5139d32e03462257902cea542bc87bb5c1ab9ffd
+Subproject commit dfc02e5e9c625501b0297e02be69d67423be2218