MIPS: select CPU_PM with SUSPEND

Functionalities provided by CPU_PM are essential for suspend
to work on all platforms.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -30,7 +30,7 @@ config MIPS
 	select BUILDTIME_TABLE_SORT
 	select CLONE_BACKWARDS
 	select CPU_NO_EFFICIENT_FFS if (TARGET_ISA_REV < 1)
-	select CPU_PM if CPU_IDLE
+	select CPU_PM if CPU_IDLE || SUSPEND
 	select GENERIC_ATOMIC64 if !64BIT
 	select GENERIC_CMOS_UPDATE
 	select GENERIC_CPU_AUTOPROBE