net: phy: microchip_rds_ptp: improve HW ts config logic

net: phy: microchip_rds_ptp: improve HW ts config logic

The driver stores new HW timestamping configuration values
unconditionally and may create inconsistency with what is actually
configured in case of error. Improve the logic to store new values only
once everything is configured.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20260106160723.3925872-4-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>