gbmcweb gbmc-release-26.19.x: SRCREV bump 60c99e5dc9..88280ea893

Collin Wright (1):
      Add GenerateSignedCSR action to RootOfTrust schema and authz mappings

gBMC Team (12):
      Provide CredentialManager to ManagedObjectStore and tlBMC Store.
      Pass CredentialManager created from RedfishServiceConfig to ManagedObjectStore and tlBMC RedfishApp in webserver_main_setup.h.
      Fix plugin interface header
      Add support for the GenerateSignedCSR action under RootOfTrustCollection in google_service_root.h in bmcweb, enabling CSR generation with TPM attestation and endorsement signatures via securityd.
      Hides the implementation of CredentialManager to remove extra dependencies
      Remove CredentialManager from ManagedStore
      Provide CredentialManager to google_api for GenerateSignedCSR without ManagedStore dependency.
      Add Build Flag to Guard Root of Trust actions
      Fix CredentialManager sharing and combined server certificate installation.
      Do not create CredentialManager in server.cc if not injected.
      Add support in gbmc-hal for a new vEEPROM version
      Fix async races in gbmcweb's http_client

Fusion-Link: fusion2 N/A
Platforms-Affected: platform24, platform31
Tested: N/A
Google-Bug-Id: 524315957,527528182
Google-Bug-Id: 527528182
Google-Bug-Id: 545239300
Google-Bug-Id: 552006457
Google-Bug-Id: 555430509
Change-Id: I030a39307059888988781eff809a5d5149ee4827
Signed-off-by: Yolkee Huang <cweihuang@google.com>