Unbreak booting of FreeBSD/mips by merging r195429 from projects/mips:

- Move dpcpu initialization to mips_proc0_init. It's
    more appropriate place for it. Besides dpcpu_init
    requires pmap module to be initialized and calling it
    int pmap.c hangs the system

sys/mips/mips/machdep.c

@@ -274,6 +274,9 @@ mips_proc0_init(void)
 	    (thread0.td_kstack_pages - 1) * PAGE_SIZE) - 1;
 	thread0.td_frame = &thread0.td_pcb->pcb_regs;
 
+	/* Steal memory for the dynamic per-cpu area. */
+	dpcpu_init((void *)pmap_steal_memory(DPCPU_SIZE), 0);
+
 	/*
 	 * There is no need to initialize md_upte array for thread0 as it's
 	 * located in .bss section and should be explicitly zeroed during 

sys/mips/mips/pmap.c

@@ -331,9 +331,6 @@ pmap_bootstrap(void)
 	msgbufp = (struct msgbuf *)pmap_steal_memory(MSGBUF_SIZE);
 	msgbufinit(msgbufp, MSGBUF_SIZE);
 
-	/* Steal memory for the dynamic per-cpu area. */
-	dpcpu_init((void *)pmap_steal_memory(DPCPU_SIZE), 0);
-
 	/*
 	 * Steal thread0 kstack.
 	 */