fix(cpus): remove accidental alto cpu addition

In commit@3bfa5a006de6f919857dfa61b81a9492aa8a2738
during a large patch cherry-pick an accidental addition of alto
cpu has occurred, 2.12 LTS branch never had alto cpu support first
in place this accidental addition should be reverted to avoid
having extra CPU's to support in 2.12 LTS branch.

Change-Id: I04cb5394a8caf32a69775e6236cb9c09aadf7662
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
1 file changed