MIPS: Make a needlessly global symbol static in arch/mips/kernel/smp.c
MIPS: Make a needlessly global symbol static in arch/mips/kernel/smp.c

The variable cpu_callin_map is needlessly defined global, so let's
make it static now.

Build-tested using malta_defconfig.

Signed-off-by: Dmitri Vorobiev <c182faaccd98c386beebc1be0ad63ed5bc4ff904@movial.com>
Signed-off-by: Ralf Baechle <92f48d309cda194c8eda36aa8f9ae28c488fa208@linux-mips.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs