CPU: Add NIOS2 support

The NIOS2 CPU is little-endian.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Thomas Chou <thomas@wytron.com.tw>
Cc: Walter Goossens <waltergoossens@home.nl>
Change-Id: Ifd1bc890b2fb74168b934641c70800a029f7f0b8

CPU.h.in

@@ -88,6 +88,10 @@
 #elif defined(__mips) || defined(__mips__) || defined(__MIPS__)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
 
+/* NIOS2 */
+#elif defined(__NIOS2__) || defined(__NIOS2) || defined(__nios2__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
 /* OpenRISC 1000 */
 #elif defined(__or1k__)
 # define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG