staging: ti dspbridge: Replace find_lcm with lcm kernel func

Resendig this patch since it was missed in the last merge...

Remove find_lcm within nldr.c and use standard
kernel function lcm().

Signed-off-by: Ernesto Ramos <ernesto@ti.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>