cpufreq: blacklist Arm Vexpress platforms in cpufreq-dt-platdev

Add "arm,vexpress" to cpufreq-dt-platdev blacklist since the actual
scaling is handled by the firmware cpufreq drivers(scpi, scmi and
vexpress-spc).

Signed-off-by: Sudeep Holla <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/cpufreq-dt-platdev.c

···
 static const struct of_device_id blacklist[] __initconst = {
 	{ .compatible = "allwinner,sun50i-h6", },
 
+	{ .compatible = "arm,vexpress", },
+
 	{ .compatible = "calxeda,highbank", },
 	{ .compatible = "calxeda,ecx-2000", },