chore(cpus): fix incorrect header macro

- errata.h is using incorrect header macro ERRATA_REPORT_H fix this.
- Group errata function utilities.

Change-Id: I6a4a8ec6546adb41e24d8885cb445fa8be830148
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
(cherry picked from commit 58d98ba82db1bea008c7c02c44b7b626b2455a35)
1 file changed