MIPS: {pm,smp}-cps: use cpu_vpe_id macro

When determining the VPE ID of a CPU, make use of the cpu_vpe_id macro
which will return 0 in a non-MT kernel build. Most code is already doing
so but a couple of places weren't. Fixing this prevents a build failure
for non-MT kernels where struct cpuinfo_mips does not contain the vpe_id
field:

  arch/mips/kernel/pm-cps.c: In function 'cps_pm_enter_state':
  arch/mips/kernel/pm-cps.c:153:51: error: 'struct cpuinfo_mips' has no
      member named 'vpe_id'
    vpe_cfg = &core_cfg->vpe_config[current_cpu_data.vpe_id];

  arch/mips/kernel/smp-cps.c: In function 'wait_for_sibling_halt':
  arch/mips/kernel/smp-cps.c:363:33: error: 'struct cpuinfo_mips' has no
      member named 'vpe_id'
    unsigned vpe_id = cpu_data[cpu].vpe_id;

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 949f2c6..f9b53b4 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -360,7 +360,7 @@
 static void wait_for_sibling_halt(void *ptr_cpu)
 {
 	unsigned cpu = (unsigned)ptr_cpu;
-	unsigned vpe_id = cpu_data[cpu].vpe_id;
+	unsigned vpe_id = cpu_vpe_id(&cpu_data[cpu]);
 	unsigned halted;
 	unsigned long flags;