Relax the validation on sdp attr size

Changing from exact size match to greater than or equal
to make the fix less prone to regression.

Bug: 263958603
Test: atest net_test_stack_a2dp_native
Ignore-AOSP-First: security
Tag: #security

Merged-In: I03522897e93af59508efa2f536dd217d48f78110
Change-Id: I03522897e93af59508efa2f536dd217d48f78110
(cherry picked from commit b608afa0)