UPSTREAM: arm64: smp: prepare for smp_processor_id() rework

UPSTREAM: arm64: smp: prepare for smp_processor_id() rework

Subsequent patches will make smp_processor_id() use a percpu variable.
This will make smp_processor_id() dependent on the percpu offset, and
thus we cannot use smp_processor_id() to figure out what to initialise
the offset to.

Prepare for this by initialising the percpu offset based on
current::cpu, which will work regardless of how smp_processor_id() is
implemented. Also, make this relationship obvious by placing this code
together at the start of secondary_start_kernel().

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Bug: 38331309
Change-Id: I43304d06602216fbb5b968ff83e0face11e238f5
(cherry picked from commit 580efaa7ccfb8c0790dce4396434f0e5ac8d86ee)
Signed-off-by: Zubin Mithra <zsm@google.com>