cryptodev-module: Backport a patch to fix build failure with kernel v5.8

Fix the following build failure with linux-yocto-dev

zc.c:61:17: error: 'struct mm_struct' has no member named 'mmap_sem';
did you mean 'mmap_base'?
   61 |  down_read(&mm->mmap_sem);
      |                 ^~~~~~~~
      |                 mmap_base
zc.c:77:15: error: 'struct mm_struct' has no member named 'mmap_sem';
did you mean 'mmap_base'?
   77 |  up_read(&mm->mmap_sem);
      |               ^~~~~~~~
      |               mmap_base

(From OE-Core rev: fe668065)

Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>