Use r4k_wait as the CPU wait function for XLR/XLS processors.
Signed-off-by: NJayachandran C <jayachandranc@netlogicmicro.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2728/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>