arm64: dts: corstone1000: Add definitions for secondary CPU cores

arm64: dts: corstone1000: Add definitions for secondary CPU cores

Add cpu{1-3} device nodes to the corstone1000 device tree to enable the
support for secondary CPU cores.

This update facilitates symmetric multiprocessing (SMP) support on the
corstone1000 Fixed Virtual Platform (FVP), allowing the secondary cores
to be properly initialised and utilised.

Only FVP platform will have SMP support and hence the secondary cpu
definitions are not added to corstone1000.dtsi.

Signed-off-by: Hugues KAMBA MPIANA <hugues.kambampiana@arm.com>
Message-Id: <20250303170012.469576-1-hugues.kambampiana@arm.com>
(sudeep.holla: Added psci enable-method for cpu0)
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>