Revert "FROMLIST: modpost: Make static exports fatal"

This reverts commit db78f3b1.

Reason for revert: Pulling upstream changes which accomplish the same thing. See https://android-review.googlesource.com/c/kernel/common/+/1559676



Change-Id: I924e794d9987994d88aa0e6c11e1062e2b046947
Signed-off-by: Melody Olvera <molvera@codeaurora.org>