MIPS: Add detection of DSP ASE Revision 2.

[ralf@linux-mips.org: This patch really only detects the ASE and passes its
existence on to userland via /proc/cpuinfo.  The DSP ASE Rev 2. adds new
resources but no resources that would need management by the kernel.]

Signed-off-by: Steven J. Hill <sjhill@mips.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4165/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/proc.c

@@ -70,6 +70,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		      cpu_has_mips3d ? " mips3d" : "",
 		      cpu_has_smartmips ? " smartmips" : "",
 		      cpu_has_dsp ? " dsp" : "",
+		      cpu_has_dsp2 ? " dsp2" : "",
 		      cpu_has_mipsmt ? " mt" : ""
 		);
 	seq_printf(m, "shadow register sets\t: %d\n",