Revert following commits:

commit acec05fb ("net_tstamp: Add TIMESTAMPING SOFTWARE and HARDWARE mask")
commit 11d55be0 ("net: ethtool: Add a command to expose current time stamping layer")
commit bb8645b0 ("netlink: specs: Introduce new netlink command to get current timestamp")
commit d905f9c7 ("net: ethtool: Add a command to list available time stamping layers")
commit aed5004e ("netlink: specs: Introduce new netlink command to list available time stamping layers")
commit 51bdf316 ("net: Replace hwtstamp_source by timestamping layer")
commit 0f7f463d ("net: Change the API of PHY default timestamp to MAC")
commit 091fab12 ("net: ethtool: ts: Update GET_TS to reply the current selected timestamp")
commit 152c75e1 ("net: ethtool: ts: Let the active time stamping layer be selectable")
commit ee60ea6b ("netlink: specs: Introduce time stamping set command")

They need more time for reviews.

Link: https://lore.kernel.org/all/20231118183529.6e67100c@kernel.org/Signed-off-by: Jakub Kicinski <kuba@kernel.org>