arm64: dts: ti: k3-j721s2-main: Add dts nodes for EHRPWMs

commit 439c0dff56266ea6c0f4ed531e877532c5ff84e9 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Add dts nodes for 6 EHRPWM instances on SoC

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Rahul T R <r-ravikumar@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>