Support for MIPS cpu P6600

Signed-off-by: Shivraj Patil <shivraj.patil@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 6803a298)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

configure

@@ -4336,7 +4336,7 @@ elif enabled mips; then
                 enable mips32r2
                 disable msa
             ;;
-            p5600|i6400)
+            p5600|i6400|p6600)
                 disable mipsdsp
                 disable mipsdspr2
             ;;
@@ -4401,6 +4401,10 @@ elif enabled mips; then
                 enable mips64r6
                 check_cflags "-mtune=i6400 -mabi=64" && check_cflags "-msched-weight -mload-store-pairs -funroll-loops" && check_ldflags "-mabi=64"
             ;;
+            p6600)
+                enable mips64r6
+                check_cflags "-mtune=p6600 -mabi=64" && check_cflags "-msched-weight -mload-store-pairs -funroll-loops" && check_ldflags "-mabi=64"
+            ;;
         esac
     else
         # We do not disable anything. Is up to the user to disable the unwanted features.