Linux: Remove epoll_create, inotify_init from syscalls.list

Their presence causes stub warnings to be created on architectures
which do not implement them.

Fixes commit d1d23b13 ("Lninux: consolidate
epoll_create implementation") and commit 842128f1
("Linux: consolidate inotify_init implementation").

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>