Adding test to check that ASN.1 lengths are properly encoded

This test checks that length metadata for the ASN.1 encoding of
attestation application ids are correct. It generates an app id that
will have a length between 127 and 256, which should create an encoding
that requires two bytes of length metadata - one byte to specify how many
bytes are needed for the length, and one byte for the length.

Some implementations of keymaster only use one byte in this case, which
will fail on strict ASN.1 parsers.

Bug: 142674020
Test: m VtsHalKeymasterV4_0TargetTest && adb sync data \
&& adb shell data/nativetest64/VtsHalKeymasterV4_0TargetTest/VtsHalKeymasterV4_0TargetTest

Change-Id: I7dfc38a09247eb3cb237f33a202044668d15cbca