helper/jim-nvp: remove unused function Jim_nvpInit()

helper/jim-nvp: remove unused function Jim_nvpInit()

The files jim-nvp.[ch] were originally inside jimtcl, then in 2011
they were dropped by jimtcl and integrated in OpenOCD.
The initial purpose was to make them as an independent library,
thus the presence of an 'init' function. Being now part of OpenOCD
do not require the 'init' function anymore, that is still empty
and unused, plus its name is in violation of the coding style.

Drop the function Jim_nvpInit().

Change-Id: I429e10444c86a26dbdc22aa071315324dc5edc3e
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6187
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>