linux-libc-headers: Fix invalid conversion in cn_proc.h

linux-libc-headers: Fix invalid conversion in cn_proc.h

Backport 'connector: Fix invalid conversion in cn_proc.h' commit to fix
error:
/
|/usr/include/linux/cn_proc.h: In function 'proc_cn_event
| valid_event(proc_cn_event)':
|/usr/include/linux/cn_proc.h:72:17: error: invalid conversion from
| 'unsigned int' to 'proc_cn_event' [-fpermissive]
|   72 |         ev_type &= PROC_EVENT_ALL;
|      |                 ^
|      |                 |
|      |                 unsigned int
\

Change is already merged in kernel branch linux-6.6.y [1].

1 - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.6.y&id=06e785aeb9ea8a43d0a3967c1ba6e69d758e82d4

Signed-off-by: Fabio Berton <fbberton@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>