dsp563xx_once: Correct definition of JTAG_INSTR_CLAMP

I've been working on Rodrigo on adding support to flash
Freescale dsp56800e devices and have been looking at the
dsp563xx code.  I think the define for the JTAG CLAMP
instruction in dsp563xx_once.c is incorrect.  It should
be 0x05 according the Freescale AN2074 (and is also
0x05 in the dsp568xx according to AN1935).  It won't
actually change anything in OpenOCD since this define
is not used anywhere (as far as I can tell).

src/target/dsp563xx_once.c

@@ -37,8 +37,8 @@
 #define JTAG_INSTR_EXTEST		0x00
 #define JTAG_INSTR_SAMPLE_PRELOAD	0x01
 #define JTAG_INSTR_IDCODE		0x02
-#define JTAG_INSTR_CLAMP		0x03
 #define JTAG_INSTR_HIZ			0x04
+#define JTAG_INSTR_CLAMP		0x05
 #define JTAG_INSTR_ENABLE_ONCE		0x06
 #define JTAG_INSTR_DEBUG_REQUEST	0x07
 #define JTAG_INSTR_BYPASS		0x0F