external/kernel-headers: rename aarch64 target to arm64

Rename aarch64 build targets to arm64.  The gcc toolchain is still
aarch64.

Change-Id: Ia92d8a50824e5329cf00fd6f4f92eae112b7f3a3
32 files changed
tree: e385b388f2dba35e623a05646942ceaf1c5a3990
  1. original/
  2. CleanSpec.mk