svf: Fix debug and error messages that print hex buffer

svf: Fix debug and error messages that print hex buffer

Added SVF_BUF_LOG macro to properly print the hex buffer of parsed
string for SIR, SDR, TDI, TDO and MASK. The original debug and error
logs with respect to printing real values were misleading and also
had endianess issues. All the bits are printed now instead of just
u32 values.

Change-Id: Ie89902403bdb61ff458418446c2ca1253ea2a63f
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Reviewed-on: http://openocd.zylin.com/1964
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Tested-by: jenkins