build_rootfs.sh: Add support for ampere/gigabyte

These servers use the ARM pl011 serial uart, not 8250.

Bug: 243811804
Change-Id: I80456adf39c6c19972af890bc2c9d84f05a50bc8
1 file changed
tree: e13de5533a1c268eb6cf1dfc4987e0b0dc73e70d
  1. net/
  2. METADATA