acpi/cstate: Dispatch Cx re-probing to the target CPU

And add flag to indicate that the Cx probing is in progress, so
if idle is scheduled before the probing is done, we could safely
fallback to C1.
acpi/cstate: Break long lines; minor style changes
drm: Add linux/delay.h, implement msleep()
drm/radeon: Replace DRM_MSLEEP() by msleep()
drm: Remove DRM_MSLEEP()
manpages: Update documentation of lock(9) to include lockowned
drm: Import asm/uaccess.h from FreeBSD's OFED stack
asm/uaccess.h: Add get_user() and put_user()

Obtained-from: linux/uaccess.h from FreeBSD's OFED stack