coccinelle: api: extend memdup_user rule with vmemdup_user()

Add vmemdup_user() transformations to the memdup_user.cocci rule.
Commit 50fd2f29 ("new primitive: vmemdup_user()") introduced
vmemdup_user(). The function uses kvmalloc with GPF_USER flag.

Signed-off-by: Denis Efremov <efremov@linux.com>