staging: speakup: reuse native kernel functions

We have simple_strtoul and simple_strtol. Don't repeat their functionality
here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/speakup/kobjects.c
Simple merge

diff --cc drivers/staging/speakup/main.c
Simple merge

diff --cc drivers/staging/speakup/speakup.h
Simple merge

diff --cc drivers/staging/speakup/varhandlers.c
Simple merge