Global: Move ArmLib to MdePkg

Per
https://edk2.groups.io/g/devel/topic/move_armlib_to_baselib/118541649,
this commit moves ArmLib to MdePkg and updates all consumers.

The only change to ArmLib itself is to remove ArmPkg.dec from
the inf.

Continuous-integration-options: PatchCheck.ignore-multi-package

Signed-off-by: Oliver Smith-Denny <osde@microsoft.com>
21 files changed