Adapt a number of regression tests to Android

Adapt a number of regression tests to Android

* test/infra/android/test-controller.el (ats-run-test): Strip
text properties from value string.  Inhibit text conversion.

* test/lisp/emacs-lisp/find-func-tests.el
(find-func-tests--locate-symbols):

* test/lisp/emacs-lisp/rmc-tests.el
(test-rmc--add-key-description)
(test-rmc--add-key-description/with-attributes)
(test-rmc--add-key-description/non-graphical-display)
(test-read-multiple-choice, test-read-multiple-choice-help):
Skip on Android in some wise or another.

(cherry picked from commit 2938afab3685f29c80d67f179ce8a935f6c27921)