Do not verify field count in tests used in CTS

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1952107

Tests in tests/common and tests/cts are run as part of CtsNetTestCases.
Many used assertFieldCountEquals in parceling/unparceling tests to
ensure that unexpected fields were not added, or that they were not
missed when testing parceling/unparceling.

However with many of the classes updatable through module updates, the
field count may change in the future, breaking CTS tests.

Stop checking for the field count, as it would break on module releases,
and its value is lower than the maintenance cost.

Bug: 205901761
Test: atest CtsNetTestCases

Merged-In: Ie53474eecf0a836788ee15b45adc7a7980c12355
Merged-In: I79854741f7e834574d4825bb737ef507785310fe
Merged-In: Ib1701358f9058aeaaa336be8d074cfaa700c4309
(cherry picked from commit 9a2a8e5205d3aad8c16037f440770a979ca4b103)
(cherry picked from commit 64dd2c35f1606b5431a0d37dc3e6037e6974aff0)

Change-Id: I74d43b3ede00f893cf30a18c58fba32a897530e1
27 files changed