dt-bindings: net: macb: add property indicating timer adjust mode

The GEM IP has two methods for modifying the ptp timer. The first of
these, named "increment mode", relies on software controlling the timer
by setting tsu_timer_incr and tsu_timer_incr_sub_nsec and performing
once-off adjustments via the tsu_timer_adjust register. This is what the
macb driver uses. The second mechanism, "timer adjust mode" uses the
gem_tsu_inc_ctrl and gem_tsu_ms signals to control the timer. These
modes are not intended to be used in parallel, but both can be possible
on the same device and which mode is used cannot be determined from the
compatible on all devices, because some users of the GEM IP are SoC
FPGAs that permit configuring how the IP is wired up.

Add a property to indicate that gem_tsu_inc_ctrl and gem_tsu_ms are wired
up for timer adjust mode.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260325-daily-entitle-3640f7254da4@spud
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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