cpuidle: big_little: Fix build error

big_little CPU idle driver references functions defined in MCPM driver.
Thus make it depend on MCPM to avoid the following errors:

drivers/built-in.o: In function `bl_enter_powerdown':
drivers/cpuidle/cpuidle-big_little.c:134: undefined reference to `mcpm_cpu_powered_up'
drivers/built-in.o: In function `bl_powerdown_finisher':
drivers/cpuidle/cpuidle-big_little.c:104: undefined reference to `mcpm_set_entry_vector'
drivers/cpuidle/cpuidle-big_little.c:111: undefined reference to `mcpm_cpu_suspend'
make: *** [vmlinux] Error 1

Reported-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/Kconfig.arm

@@ -10,6 +10,7 @@ config ARM_ARMADA_370_XP_CPUIDLE
 config ARM_BIG_LITTLE_CPUIDLE
 	bool "Support for ARM big.LITTLE processors"
 	depends on ARCH_VEXPRESS_TC2_PM
+	depends on MCPM
 	select ARM_CPU_SUSPEND
 	select CPU_IDLE_MULTIPLE_DRIVERS
 	help