devfreq: exynos-ppmu: use node names with hyphens

Devicetree naming convention requires device node names to use hyphens
instead of underscore, so Exynos5422 devfreq event name
"ppmu-event3-dmc0_0" should be "ppmu-event3-dmc0-0".  Newly introduced
dtschema enforces this, however the driver still expects old name with
an underscore.

Add new events for Exynos5422 while still accepting old name for
backwards compatibility.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/devfreq/event/exynos-ppmu.c

@@ -94,11 +94,16 @@ static struct __exynos_ppmu_events {
 	PPMU_EVENT(d1-general),
 	PPMU_EVENT(d1-rt),
 
-	/* For Exynos5422 SoC */
+	/* For Exynos5422 SoC, deprecated (backwards compatible) */
 	PPMU_EVENT(dmc0_0),
 	PPMU_EVENT(dmc0_1),
 	PPMU_EVENT(dmc1_0),
 	PPMU_EVENT(dmc1_1),
+	/* For Exynos5422 SoC */
+	PPMU_EVENT(dmc0-0),
+	PPMU_EVENT(dmc0-1),
+	PPMU_EVENT(dmc1-0),
+	PPMU_EVENT(dmc1-1),
 };
 
 static int __exynos_ppmu_find_ppmu_id(const char *edev_name)