PM / devfreq: exynos-nocp: Select REGMAP_MMIO

This driver uses devm_regmap_init_mmio(), so select REGMAP_MMIO to avoid
build failure.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/devfreq/event/Kconfig

@@ -17,6 +17,7 @@ config DEVFREQ_EVENT_EXYNOS_NOCP
 	tristate "EXYNOS NoC (Network On Chip) Probe DEVFREQ event Driver"
 	depends on ARCH_EXYNOS || COMPILE_TEST
 	select PM_OPP
+	select REGMAP_MMIO
 	help
 	  This add the devfreq-event driver for Exynos SoC. It provides NoC
 	  (Network on Chip) Probe counters to measure the bandwidth of AXI bus.