cpufreq: Replace deprecated strncpy() with strscpy()

`strncpy` is deprecated for use on NUL-terminated destination strings [1].

We should prefer more robust and less ambiguous string interfaces.

Both `policy->last_governor` and `default_governor` are expected to be
NUL-terminated which is shown by their heavy usage with other string
apis like `strcmp`.

A suitable replacement is `strscpy` [2] due to the fact that it guarantees
NUL-termination on the destination buffer.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: KSPP#90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20230913-strncpy-drivers-cpufreq-cpufreq-c-v1-1-f1608bfeff63@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>

Author: JustinStitt

drivers/cpufreq/cpufreq.c

@@ -1650,7 +1650,7 @@ static void __cpufreq_offline(unsigned int cpu, struct cpufreq_policy *policy)
 	}
 
 	if (has_target())
-		strncpy(policy->last_governor, policy->governor->name,
+		strscpy(policy->last_governor, policy->governor->name,
 			CPUFREQ_NAME_LEN);
 	else
 		policy->last_policy = policy->policy;
@@ -2996,7 +2996,7 @@ static int __init cpufreq_core_init(void)
 	BUG_ON(!cpufreq_global_kobject);
 
 	if (!strlen(default_governor))
-		strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN);
+		strscpy(default_governor, gov->name, CPUFREQ_NAME_LEN);
 
 	return 0;
 }