fix(cpus): put back the global declaration for erratum #3701747

Patch 89dba82df accidentally removed it. Put it back.

Change-Id: Ic7a5a13ae89b0b86ccbea56fecfe12bef57a90b9
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
1 file changed