target: change prototype of target_process_reset()

target: change prototype of target_process_reset()

To prepare for handling TCL return values consistently, all calls
to command_print/command_print_sameline should be ready to switch
to CMD as first parameter.

Change prototype of target_process_reset() to pass CMD instead of
CMD_CTX.
Replace NULL parameter of command_print().
Remove extra newline, already added by command_print().

Change-Id: Ieb820c2586e1ff74a0c2b63a9c8693ca7710dfb7
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5048
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>