Revert "include: linux: added include export.h to fix compat compiling"

This reverts commit 42be0266ab3a3713d8a7e770e7cebfa8b9a31e2f.
Revert "module.h: split out the EXPORT_SYMBOL into export.h"

This reverts commit c074fa16ac69c2957b35aa7eff535cb17aca9e69.