tc2: rename codenamed cores to their product names
The cores Hunter ELP, Hunter, Hayes become Cortex X4, Cortex A720, Cortex A520 respectively.
Update all references in code to reflect this.
Signed-off-by: Boyan Karatotev boyan.karatotev@arm.com Co-developed-by: Yu Shihai yu.shihai@arm.com Signed-off-by: Quoc Khanh Le quockhanh.le@arm.com