Add support for user-supplied QEMU flags

Routes user-supplied QEMU flags to both dtb generation and the main QEMU
run with the exception of "-S", which is only routed to the main QEMU
run to avoid pausing the dtb generation.

Bug: 123904362
Test: ./run -- -s -S
Change-Id: I0c46bcd465066dbcf0b0e027e308c959eece1ed1
1 file changed
tree: 219d1f962487ee5cd68459e716ea6c5ce3e2cb52
  1. .clang-format
  3. PREUPLOAD.cfg
  4. project/