nds32: Use the correct method to access registers

The registers are represented as bit arrays intended to be accessed using
the buf_set_* and buf_get_* functions. Storing the register values in
integers enables accessing them directly, which gives different results
depending on host byte order.

Convert the register store to use a byte array instead and fix all the
byte order bugs uncovered by that.

Also merge the 32 and 64 bit register fields. Only one of them is used at
a time and after the change to byte arrays their types are also the same.

Change-Id: I456869a1737f4b4f5e8ecbfc1c63c49a75d21619
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/2475
Tested-by: jenkins
Reviewed-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

src/target/nds32.h

@@ -362,8 +362,7 @@ struct nds32 {
 
 struct nds32_reg {
 	int32_t num;
-	uint32_t value;
-	uint64_t value_64;
+	uint8_t value[8];
 	struct target *target;
 	struct nds32 *nds32;
 	bool enable;