riscv: Move call to init_cpu_topology() to later initialization stage

If "capacity-dmips-mhz" is present in a CPU DT node,
topology_parse_cpu_capacity() will fail to allocate memory.  arm64, with
which this code path is shared, does not call
topology_parse_cpu_capacity() until later in boot where memory
allocation is available.  While "capacity-dmips-mhz" is not yet a valid
property on RISC-V, invalid properties should be ignored rather than
cause issues.  Move init_cpu_topology(), which calls
topology_parse_cpu_capacity(), to a later initialization stage, to match
arm64.

As a side effect of this change, RISC-V is "protected" from changes to
core topology code that would work on arm64 where memory allocation is
safe but on RISC-V isn't.

Fixes: 03f11f03dbfe ("RISC-V: Parse cpu topology during boot.")
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Signed-off-by: Ley Foon Tan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[Palmer: use Conor's commit text]
Link: https://lore.kernel.org/linux-riscv/[email protected]/T/#me592d4c8b9508642954839f0077288a353b0b9b2
Signed-off-by: Palmer Dabbelt <[email protected]>

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