Bluetooth: Shell: BR: Update command `sdp-find`

Since the function `bt_sdp_discover` has been updated, the caller of
function needs to be updated to avoid the building and functionality
fault.

Add set the parameter `type` to value
`BT_SDP_DISCOVER_SERVICE_SEARCH_ATTR`.

Update the SDP discovery callback function. Make it align with
`bt_sdp_discover_func_t`.

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