arm64: dts: ti: k3-am62a: Remove syscon compatible from epwm_tbclk

The other instances have been fixed, but AM62a seems to have been missed,
fix this here.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20230802174521.236255-1-afd@ti.com


Signed-off-by: Nishanth Menon <nm@ti.com>