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>