Merge branch 'net-stmmac-further-ptp-cleanups'

Russell King says:

====================
net: stmmac: further ptp cleanups

The first uses a local variable when setting n_ext_ts which is a minor
simplification of the code. The second removes the now unnecessary
"available" flag for the PPS outputs.
====================

Link: https://patch.msgid.link/aawDiK7DjcSXSs1X@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>