net: ravb: Use common defines for time stamping control

net: ravb: Use common defines for time stamping control

Instead of translating to/from driver specific flags for packet time
stamp control use the common flags directly. This simplifies the driver
as the translating code can be removed while at the same time making it
clear the flags are not flags written to hardware registers.

The change from a device specific bit-field track variable to the common
enum datatypes forces us to touch the ravb_rx_rcar_hwstamp() in a non
trivial way. To make this cleaner and easier to understand expand the
nested conditions.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://patch.msgid.link/20251104222420.882731-8-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>