percpu-rwsem: remove the unused parameter 'read'

In the function percpu_rwsem_release, the parameter `read`
is unused, so remove it.

Signed-off-by: Wang Long <w@laoqinren.net>
Link: https://lore.kernel.org/r/20240802091901.2546797-1-w@laoqinren.net


Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>