ipq806x: add missing scaling_available_frequencies for dedicated cpufreq

Add missing scaling_available_frequencies sysfs entry for dedicated
cpufreq driver.
This sysfs entry is not standard and each cpufreq driver needs to
provide it and declare it in the cpufreq driver struct attr.

Fixes: 5dbbefc ("ipq806x: introduce dedicated krait cpufreq")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

target/linux/ipq806x/patches-5.4/098-1-cpufreq-add-Krait-dedicated-scaling-driver.patch

@@ -75,7 +75,7 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
  ##################################################################################
 --- /dev/null
 +++ b/drivers/cpufreq/qcom-cpufreq-krait.c
-@@ -0,0 +1,603 @@
+@@ -0,0 +1,609 @@
 +// SPDX-License-Identifier: GPL-2.0
 +
 +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -435,6 +435,11 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +	return 0;
 +}
 +
++static struct freq_attr *krait_cpufreq_attr[] = {
++	&cpufreq_freq_attr_scaling_available_freqs,
++	NULL,
++};
++
 +static struct cpufreq_driver krait_cpufreq_driver = {
 +	.flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK |
 +		 CPUFREQ_IS_COOLING_DEV,
@@ -446,6 +451,7 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +	.online = cpufreq_online,
 +	.offline = cpufreq_offline,
 +	.name = "krait-cpufreq",
++	.attr = krait_cpufreq_attr,
 +	.suspend = cpufreq_generic_suspend,
 +};
 +