MIPS: Alchemy: Au1300 SoC support

Add basic support for the Au1300 variant(s):
- New GPIO/Interrupt controller
- DBDMA ids
- USB setup
- MMC support
- enable various PSC drivers
- detection code.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2866/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/cpu-probe.c

@@ -1014,6 +1014,13 @@ static inline void cpu_probe_netlogic(struct cpuinfo_mips *c, int cpu)
 {
 	decode_configs(c);
 
+	if ((c->processor_id & 0xff00) == PRID_IMP_NETLOGIC_AU13XX) {
+		c->cputype = CPU_ALCHEMY;
+		__cpu_name[cpu] = "Au1300";
+		/* following stuff is not for Alchemy */
+		return;
+	}
+
 	c->options = (MIPS_CPU_TLB       |
 			MIPS_CPU_4KEX    |
 			MIPS_CPU_COUNTER |