Add build rules and test config for kselftests on x86 32

Bug: 291147200
Signed-off-by: Edward Liaw <edliaw@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:71f973ebfe389ccb1594b47743f20d795af29bdd)
Merged-In: I6a9957bcf13a27c4b91d45a044b8985f1938b8ee
Change-Id: I6a9957bcf13a27c4b91d45a044b8985f1938b8ee