ci: sync hafnium submodules to internal gerrit

Added necessary support in the scripts to sync three of hafnium
submodules to internal gerrit.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I2fce3db1bcef0e4a97491bd3e9f64d9866e384f2
2 files changed