MIPS: Add MIPS P5600 probe support

Add a case in cpu_probe_mips for the MIPS P5600 processor ID, which sets
the CPU type to the new CPU_P5600.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6409/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/cpu-probe.c

@@ -844,6 +844,10 @@ static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
 		c->cputype = CPU_PROAPTIV;
 		__cpu_name[cpu] = "MIPS proAptiv (multi)";
 		break;
+	case PRID_IMP_P5600:
+		c->cputype = CPU_P5600;
+		__cpu_name[cpu] = "MIPS P5600";
+		break;
 	}
 
 	decode_configs(c);