usertools: fix binding built-in kernel driver

[ upstream commit 7a016af4 ]

A driver can be loaded as a dynamic module or a built-in module.
In commit 681a6728 ("usertools: check if module is loaded
before binding"), the script only checks modules in /sys/module/.

However, for built-in kernel driver, it only shows up in /sys/module/,
if it has a version or at least one parameter. So add check for
modules in /lib/modules/$(uname -r)/modules.builtin.

Fixes: 681a6728 ("usertools: check if module is loaded before binding")

Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>