The global smp variables in riscv are replaced with smp machine properties.

A local variable of the same name would be introduced in the declaration
phase if it's used widely in the context OR replace it on the spot if it's
only used once. No semantic changes.
Signed-off-by: NLike Xu <like.xu@linux.intel.com>
Message-Id: <20190518205428.90532-6-like.xu@linux.intel.com>
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
[ehabkost: fix spike_board_init()]
[ehabkost: fix riscv_sifive_e_soc_init()]
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>