BQLmon: display driver info

It might be useful to get some information about the underlying driver
that is being used, print that. While at it, remove 'interrupted' since
that variable is unused.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
BQLmon: do not open code some ncurses functions

Use the functions that directly output a character or string at the
specified coordinates instead of doing a move + output.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>