mips: put "disable mipsfpu" in a better place for loongson

Let's disable the ISAs first, and then the core capabilities, as we do
for the rest of the cores. This way the code is better organized.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

configure

@@ -4198,11 +4198,11 @@ elif enabled mips; then
             add_asflags "-mfp64"
         ;;
         loongson*)
-            disable mipsfpu
             disable mips32r2
             disable mips32r6
             disable mips64r2
             disable mips64r6
+            disable mipsfpu
             disable mipsdsp
             disable mipsdspr2
             disable msa