MIPS: Loongson64: Select mac2008 only feature

Some Loongson-64 processor didn't set MAC2008 bit in fcsr,
but actually all Loongson64 processors are MAC2008 only.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: chenhc@lemote.com
Cc: paul.burton@mips.com
Cc: linux-kernel@vger.kernel.org

arch/mips/include/asm/mach-loongson64/cpu-feature-overrides.h

@@ -46,5 +46,6 @@
 #define cpu_has_wsbh		1
 #define cpu_has_ic_fills_f_dc	1
 #define cpu_hwrena_impl_bits	0xc0000000
+#define cpu_has_mac2008_only	1
 
 #endif /* __ASM_MACH_LOONGSON64_CPU_FEATURE_OVERRIDES_H */