refactor(drivers/marvell/comphy-3700): unify Generation Settings register names

Sometimes we call the constants GENx_SET_y, sometimes GENx_SETTINGS_y,
and sometimes GENx_SETTING_y.

Unify this into GENx_SETy.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Change-Id: I3810fb52b2897fe6730ef6e58d434c47cfef14a9
2 files changed