pmt_unpin - unpin pages and revoke device access to them
#include <zircon/syscalls.h>
zx_status_t zx_pmt_unpin(zx_handle_t handle);
zx_pmt_unpin() unpins pages that were previously pinned by zx_bti_pin(),
and revokes the access that was granted by the pin call.
Always consumes handle. It is invalid to use handle afterwards, including
to call zx_handle_close() on it.
TODO(ZX-2399)
On success, zx_pmt_unpin() returns ZX_OK.
In the event of failure, a negative error value is returned.
ZX_ERR_BAD_HANDLE handle is not a valid handle.
ZX_ERR_WRONG_TYPE handle is not a PMT handle.