ptp: clockmatrix: reset device and check BOOT_STATUS

SM_RESET device only when loading full configuration and check
for BOOT_STATUS. Also remove polling for write trigger done in
_idtcm_settime().

Changes since v1:
-Correct warnings from strict checkpatch

Signed-off-by: Min Li <min.li.xe@renesas.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/1607442117-13661-1-git-send-email-min.li.xe@renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>