Revert "Load modules from _16K dir when running on 16K kernel"

This reverts commit ffdb017e.

Overriding an explicitly-specified module path (e.g. passed via the
'-d <path>' argument) because the kernel is using 16KiB pages is
inconsistent and unexpected. Revert this change in anticipation of
filtering incompatible modules instead.

Bug: 343971855
Test: Verified that _16k module directory is excluded by modprobe when running in userspace fastboot with 4k pages.
Change-Id: If9c6e2d26fc53b12f543d531d64ef3d288ddc179