MIPS: Hardwire detection of DSP ASE Rev 2 for systems, as required.

Most supported systems currently hardwire cpu_has_dsp to 0, so we also
can disable support for cpu_has_dsp2 resulting in a slightly smaller
kernel.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-ip28/cpu-feature-overrides.h

@@ -27,6 +27,7 @@
 #define cpu_has_dc_aliases	0 /* see probe_pcache() */
 #define cpu_has_ic_fills_f_dc	0
 #define cpu_has_dsp		0
+#define cpu_has_dsp2		0
 #define cpu_icache_snoops_remote_store  1
 #define cpu_has_mipsmt		0
 #define cpu_has_userlocal	0