Add validation on sdp attributes in bta_ag_sdp.cc

Bug: 263958603
Test: atest bt_host_test_bta
Ignore-AOSP-First: security
Tag: #security
Change-Id: I51c0215125808102b6cff880357d19012ffc37b9
Merged-In: I51c0215125808102b6cff880357d19012ffc37b9
(cherry picked from commit 509feb84)