adv_monitor: merge monitors with the same pattern

adv_monitor: merge monitors with the same pattern

Some bluetooth chipset (e.g. Intel) doesn't support MSFT extension
monitors with the same pattern. In order to make them work, and also
to generally make their task easier, we merge monitors with the same
pattern in the userspace. Therefore, each monitor sent to the kernel
will all have different patterns.

If the merged monitor have different RSSI parameter, we would choose
the most lenient parameter of the two, since we can still do
additional filtering in the userspace. This way, we wouldn't miss any
information and can still get the benefit of offloading the filtering.

Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>