devtmpfs: make 'devtmpfs_context_ops' static

devtmpfs: make 'devtmpfs_context_ops' static

The 'devtmpfs_context_ops' object is not exported outside the
devtmpfs.c file nor defined anywhere for use outside. Make this
static to remove the following sparse warning:

drivers/base/devtmpfs.c:88:30: warning: symbol 'devtmpfs_context_ops' was not declared. Should it be static?

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Link: https://patch.msgid.link/20260116150745.1330145-1-ben.dooks@codethink.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>