clocksource/drivers/timer-ti-dm: Fix warning for omap_timer_match

clocksource/drivers/timer-ti-dm: Fix warning for omap_timer_match

We can now get a warning for 'omap_timer_match' defined but not used.
Let's fix this by dropping of_match_ptr for omap_timer_match.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: ab0bbef3ae0f ("clocksource/drivers/timer-ti-dm: Make timer selectable for ARCH_K3")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20221028103526.40319-1-tony@atomide.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>