ci: add license/metadata for aarch64 gn prebuilt

gn prebuilt was updated in change [1] but missed METADATA and LICENSE
files additions.
Fix the version to the commit hash used for generating the gn tool [2].

[1] https://review.trustedfirmware.org/c/hafnium/prebuilts/+/11612
[2] https://gn.googlesource.com/gn/+/0d00acaef051e63969f936be5dc06ff7aac7213b

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I0209ba32b2f2154255857ffd2484e832c0eb1e99
3 files changed
tree: 6f337e7750e89090fddc0fe71e53dc295a0e6eed
  1. darwin-x64/
  2. generic/
  3. linux-aarch64/
  4. linux-x64/