runtime: move arch_mips64(le)?.go into runtime/internal/sys

Somehow these were left out of the orignial CL.

Updates #11647

Change-Id: I058a30eaa25fbb72d60e7fb6bc9ff0a3b54fdb2a
Reviewed-on: https://go-review.googlesource.com/16870
Reviewed-by: Minux Ma <[email protected]>

Author: matloob

src/runtime/arch_mips64.go

@@ -0,0 +1,19 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sys
+
+const (
+	TheChar       = '0'
+	BigEndian     = 1
+	CacheLineSize = 32
+	PhysPageSize  = 16384
+	PCQuantum     = 4
+	Int64Align    = 8
+	HugePageSize  = 0
+	MinFrameSize  = 8
+)
+
+type Uintreg uint64
+type Intptr int64 // TODO(rsc): remove

src/runtime/arch_mips64le.go

@@ -0,0 +1,19 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sys
+
+const (
+	TheChar       = '0'
+	BigEndian     = 0
+	CacheLineSize = 32
+	PhysPageSize  = 16384
+	PCQuantum     = 4
+	Int64Align    = 8
+	HugePageSize  = 0
+	MinFrameSize  = 8
+)
+
+type Uintreg uint64
+type Intptr int64 // TODO(rsc): remove