third_party/libaom: enable riscv64 for gn build
(cherry picked from commit 722b9d1afcd3918f7235a8b2525af908e3f7fd10)
Signed-off-by: Rebecca Chang Swee Fun <rebecca.chang@starfivetech.com>
Change-Id: I5d4c5a1df625a92134fd9ab3f6a60f41c9b2bc38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3855281
Reviewed-by: James Zern <jzern@google.com>
Commit-Queue: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/main@{#1039449}