refactor(cpus): convert Neoverse-N1 to use helpers

Conversion to use CPU helpers for Neoverse-N1 testing done with
framework adaptation patch.

Change-Id: I2103f6e64daf0ee4c7b756083e5bf485f15c0e21
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
1 file changed