remove kbd.c files

Reference: /n/atom/patch/applied/no9kbd
Date: Tue May  6 19:54:33 CES 2014
Signed-off-by: quanstro@quanstro.net

# rm /sys/src/9/alphapc/kbd.c
# rm /sys/src/9/bcm/kbd.c
# rm /sys/src/9/mtx/kbd.c
# rm /sys/src/9/omap/kbd.c
# rm /sys/src/9/pc/kbd.c
# rm /sys/src/9/pcpae/kbd.c
# rm /sys/src/9/teg2/kbd.c