dts: sa8195-capture: Add cpus 1 to 7

Add all cpus to devicetree, currently capture kernel has only cpu0.
This is also a workaround for the booting issue with maxcpus=1 caused
due to commit 133b9731 ("arm64: Allow boot on cpus other than
logical cpu 0").

Change-Id: Id230ecf70d6a94e2b6cd62de516ad1a3e59e813b
Signed-off-by: Akshay Adiga <aadiga@codeaurora.org>