cmn700: ccg: use correct node names in comments

CXRA and CXHA are CCIX node type. CMN-700 CCG module uses CCRA and
CCHA which are CXL node types. Rename all instances of CXRA and CXHA to
CCRA and CCHA respectively in the comments and print statements. This
patch does not cause any functionality change.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: Ib0d578927fe2da34add8c70dd8660de3c719a62a