Correct JTAG ID

From the datasheet[0] section 4.8.1: JTAG ID is 0x0B7B302F

[0] http://www.ti.com/lit/ds/spns141f/spns141f.pdf
debug logs with correct jtag ID
Add GDB integration.

Shell script writes to new log with errors when gdb connects.
.gdbinit script means we dont have to rember the connection port.
New log shows some errors on connect.