MIPS: Octeon: Delete override of cpu_has_mips_r2_exec_hazard.

This is no longer needed with the fixed, new and improved definition
of cpu_has_mips_r2_exec_hazard in <asm/cpu-features.h>.

For a discussion, see http://patchwork.linux-mips.org/patch/9539/.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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

@@ -50,7 +50,6 @@
 #define cpu_has_mips32r2	0
 #define cpu_has_mips64r1	0
 #define cpu_has_mips64r2	1
-#define cpu_has_mips_r2_exec_hazard 0
 #define cpu_has_dsp		0
 #define cpu_has_dsp2		0
 #define cpu_has_mipsmt		0