cpufreq: hisilicon: Use generic platdev driver

The cpufreq-dt-platdev driver supports creation of cpufreq-dt platform
device now, reuse that and remove similar code from platform code.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 5ad2938..ac4a0ba 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -24,6 +24,8 @@
 	{ .compatible = "allwinner,sun8i-a83t", },
 	{ .compatible = "allwinner,sun8i-h3", },
 
+	{ .compatible = "hisilicon,hi6220", },
+
 	{ .compatible = "fsl,imx27", },
 	{ .compatible = "fsl,imx51", },
 	{ .compatible = "fsl,imx53", },