BitRig/src dc6eefesys/arch/arm64/arm64 locore.S

Add arm64 'kernel' signature, cleanup

Depending on platform fdt may be passed on x0 or x2,
this also contains a change that moves the x0 content to x2 in
case this platform doesn't init the x2 if passed a NULL x2, where
the kernel later expects the fdt pointer.
DeltaFile
+56-5sys/arch/arm64/arm64/locore.S
+56-51 files

UnifiedSplitRaw