drop unused isurface interface library from swcodec

new routines in the interface library, which swcodec does not use,
result in a "you don't use all the NDK routines you reference" flag
during testing for 25Q2.

Bug: 394152026
Flag: EXEMPT refactor
Test: atest MctsMediaCodecTestCases
Change-Id: I73a00b08344e105caf4aef0f8226305c587b99ad