[media] atomisp: Fix unnecessary initialization of static

Fix checkpatch warning: removed unnecessary initialization of
static variable "skip_fwload" to 0 in source atomisp_v4l2.c

Signed-off-by: Fabrizio Perria <fabrizio.perria@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>