Add GBL_EFI_FASTBOOT_PROTOCOL.should_stop_in_fastboot

Update the `GBL_EFI_FASTBOOT_PROTOCOL` to include a
`should_stop_in_fastboot` method.

This method checks for a device signal during boot, usually a specific
button press combination, to determine whether the device should stop
in fastboot mode.

Tests: new unit tests pass

Change-Id: Ic457e8bfc8892b2c56d561b303ccc09dddba74fb
4 files changed
tree: d32bbf811e42da7af28f0e12884dcb94e697df3b
  1. gbl/
  2. libxbc/
  3. vts/
  4. .clang-format
  5. .gitignore
  6. BUILD
  7. LICENSE
  8. OWNERS