drm/tegra: sor: Factor out tegra_sor_set_parent_clock()

Switching the SOR parent clock can glitch if done while the clock is
enabled. Extract a common function that can be used to disable the
module clock, switch the parent and reenable the module clock.

Signed-off-by: Thierry Reding <treding@nvidia.com>

path: root/privs.h

#ifndef PRIVS_H
#define PRIVS_H

#include <stdbool.h>

extern void drop_privileges(bool enforce, uid_t uid, gid_t gid);

#endif /* PRIVS_H */