ARM: dts: sa515m: enable ssr and wake up sideband support

This commit enables sideband SSR and wake up support
for USB and Ethernet interconnect and unifies the
device tree node declarations among all interconnect
types.

Change-Id: I970641693364f6b48b7e1c0066d5bb0b36bc7c65
Signed-off-by: Rishi Gupta <rishgupt@codeaurora.org>