ARM: OMAP2+: fix CONFIG_CPU_IDLE dependency on CONFIG_PM

commit 164e0cbf (ARM: OMAP3/4: consolidate cpuidle Makefile) added
an OMAP-specific dependency from CPU_IDLE to CONFIG_PM.  This causes
some randconfig warnings when CONFIG_PM has unmet dependencies:

warning: (ARCH_OMAP3 && ARCH_OMAP4) selects PM which has unmet direct dependencies (PM_SLEEP || PM_RUNTIME)
warning: (ARCH_OMAP3 && ARCH_OMAP4) selects PM which has unmet direct dependencies (PM_SLEEP || PM_RUNTIME)
warning: (ARCH_OMAP3 && ARCH_OMAP4) selects PM which has unmet direct dependencies (PM_SLEEP || PM_RUNTIME)

Fix this by making the dependency on CONFIG_PM_RUNTIME (which in turn
will enable CONFIG_PM.)
Reported-by: Tony Lindgren <tony@atomide.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Kconfig

@@ -35,7 +35,7 @@ config ARCH_OMAP3
 	select CPU_V7
 	select USB_ARCH_HAS_EHCI if USB_SUPPORT
 	select ARCH_HAS_OPP
-	select PM if CPU_IDLE
+	select PM_RUNTIME if CPU_IDLE
 	select PM_OPP if PM
 	select ARM_CPU_SUSPEND if PM
 	select MULTI_IRQ_HANDLER
@@ -53,7 +53,7 @@ config ARCH_OMAP4
 	select PL310_ERRATA_727915
 	select ARM_ERRATA_720789
 	select ARCH_HAS_OPP
-	select PM if CPU_IDLE
+	select PM_RUNTIME if CPU_IDLE
 	select PM_OPP if PM
 	select USB_ARCH_HAS_EHCI if USB_SUPPORT
 	select ARM_CPU_SUSPEND if PM