ptp: ocp: fix DPLL functions

In ptp_ocp driver pin actions assume sma_nr starts with 1, but for DPLL
subsystem callback 0-based index was used. Fix it providing proper index.

Fixes: 09eeb3ae

 ("ptp_ocp: implement DPLL ops")
Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://lore.kernel.org/r/20240508132111.11545-1-vadim.fedorenko@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>