MIPS: pm-cps: Select CONFIG_MIPS_CPC

The pm-cps code can run without a CPC, although will be limited to using
only the 2 wait idle states. However the code does check for CPC
presence, and in order to work optimally the CPC support is needed. So
select it.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7279/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -2059,6 +2059,7 @@ config MIPS_CPS
 	  support is unavailable.
 
 config MIPS_CPS_PM
+	select MIPS_CPC
 	bool
 
 config MIPS_GIC_IPI