[update] fix bash completion of multiple URT installs

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
[update] add linux/bsearch.h to in-kernel includes

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
[install] Module.symvers too

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
[update] make URT_EXPORT_SYMBOL public

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>