fix(rcar3): fix CPG register code comment

Update the code comment to match referenced register.

Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Ie0ddbe0bffd31794425f0967c865e2928ce8d78d
1 file changed