MIPS: octeon: Remove cpu_has_saa

The cpu_has_saa feature macro was added along with Cavium Octeon CPU
support back in commit 5b3b1688 ("MIPS: Add Cavium OCTEON processor
support files to arch/mips/cavium-octeon.") but has never been used.

Remove the dead code.
Signed-off-by: Paul Burton <paul.burton@mips.com>

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

@@ -45,7 +45,6 @@
 #define cpu_has_ic_fills_f_dc	0
 #define cpu_has_64bits		1
 #define cpu_has_octeon_cache	1
-#define cpu_has_saa		octeon_has_saa()
 #define cpu_has_mips32r1	1
 #define cpu_has_mips32r2	1
 #define cpu_has_mips64r1	1
@@ -73,13 +72,6 @@
 #define ARCH_HAS_USABLE_BUILTIN_POPCOUNT 1
 #endif
 
-static inline int octeon_has_saa(void)
-{
-	int id;
-	asm volatile ("mfc0 %0, $15,0" : "=r" (id));
-	return id >= 0x000d0300;
-}
-
 /*
  * The last 256MB are reserved for device to device mappings and the
  * BAR1 hole.