Merged TI feature rpmsg into ti-linux-5.4.y

TI-Feature: rpmsg
TI-Branch: rpmsg-ti-linux-5.4.y-intg

* 'rpmsg-ti-linux-5.4.y-intg' of git://git.ti.com/rpmsg/rpmsg

:
  arm64: dts: ti: k3-am642-sk: Reserve some on-chip SRAM for R5Fs
  arm64: dts: ti: k3-am642-sk: Reserve memory for IPC between RTOS cores
  arm64: dts: ti: k3-am642-sk: Add DDR carveout memory nodes for R5Fs
  arm64: dts: ti: k3-am642-sk: Add mailboxes to R5Fs
  arm64: dts: ti: k3-am642-sk: Add IPC sub-mailbox nodes

Signed-off-by: LCPD Auto Merger <lcpd_integration@list.ti.com>