CPU: MIPS is biendian

MIPS machines are biendian hence they can run both big endian kernels
e.g. Debian mips architecture, and little endian kernels e.g. Debian
mipsel architecture.  Use predefined macros to distinguish them.

Change-Id: I75fccd3cb1ef7915c8754ebbb64cb52a948b4ad8
Reported-by: Mathieu Malaterre <malat@debian.org>
Inspired-by: Modestas Vainius <modax@debian.org>

CPU.h.in

@@ -76,7 +76,15 @@
 #elif defined(__m68k__) || defined(M68000)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
 
-/* MIPS */
+/* MIPSel (MIPS little endian) */
+#elif defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
+/* MIPSeb (MIPS big endian) */
+#elif defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* MIPS (fallback, big endian) */
 #elif defined(__mips) || defined(__mips__) || defined(__MIPS__)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG