arm: dts: j7200: dts sync with Linux 6.6-rc1

Sync j7200 dts with Linux 6.6-rc1

- k3-j7200-r5-common-proc-board.dts now inherits from
  k3-j7200-common-proc-board.dts instead of k3-j7200-som-p0.dtsi. This
  allows us to trim down the r5 file considerably by using existing
  properties

- remove pimux nodes from r5 file

- remove duplicate nodes & node properties from r5/u-boot files

- mcu_timer0 now used instead of timer1

  mcu_timer0 device id added to dev-data.c file in order to work

- remove cpsw node

  This node is no longer required since the compatible is now fixed

- remove dummy_clock_19_2_mhz

  This node wasn't being used anyhere, so it was removed

- remove dummy_clock_200mhz

  main_sdhci0 & main_sdhci1 no longer need dummy clock for eMMC/SD

- fix secure proxy node

  mcu_secproxy changed to used secure_prxy_mcu which is already
  defined in k3-j7200-mcu-wakeup.dtsi

- removed &mcu_ringacc property override since they're present in
  v6.6-rc1

Signed-off-by: Reid Tonking <reidt@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>