Advertisement parsing fix for zero padding

When AD data is zero padded, and Scan Response is appended at end, data
becomes invalid. Instead, zero paddning must be removed first.

Test: AdvertiseDataParserTest.RemoveTrailingZeros
Bug: 38489707
Change-Id: I229ca3db6c92bc06bc1429e72412417010721063
Merged-In: I229ca3db6c92bc06bc1429e72412417010721063
(cherry picked from commit 35a9ea352d59e6d261eba1254814f7238e3ed022)