[PATCH] generic GPIO driven matrix keypad

Hi,
the following patch adds the generic GPIO driven matrix keypad driver. I 
tested this on two devices I had available - palmtc and palmt3. It should be 
able to replace corgikbd.c later as well, but I dont have that device. And 
since this is platform independent driver, any chip that makes it's GPIOs 
available through gpiolib should be OK with this driver as well. Please 
consider applying.