Bluetooth: Classic: SDP: Refactor parsing of Service Search Pattern

In current implementation, after parsing the received service search
pattern and all matched SDP records are saved in the local variable
`matching_recs`. The max count of SDP records within its SDP
database that match the given service search pattern is
BT_SDP_MAX_SERVICES when parsing the received Service Search Pattern.
And it causes the max count registered SDP records is limited to
BT_SDP_MAX_SERVICES.

Refactor the parsing of service search pattern to remove the
limitation with the following steps.
1. Save the service search pattern to a simple buffer by calling
   the function `parse_service_search_pattern()`.
2. Traverse all registered SDP record and check for each SDP record
   if it is matched with given service search pattern by calling
   function `service_search_pattern_matched()`.
3. Use the matched SDP records to response the SDP request.

And also remove the limitation of the max count of registered SDP
records.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>