BTA_DM_DISC_BLE_RES_EVT -> BTA_DM_GATT_OVER_LE_RES_EVT and BTA_DM_GATT_OVER_SDP_RES_EVT

Differentiate between services disovered by SDP and LE GATT discovery.
Service avaliability differs between transports.

This patch is not making any functional changes, just making code
clearer.

Test: perform LE and Classic pairing to dual mode device
Bug: 248340112
Change-Id: I7be9d2c0549f8c33eff16b70d6f54dd1f08a71a0