cpupower: Recognise amd-pstate active mode driver

amd-pstate active mode driver name is "amd-pstate-epp". Use common
prefix for string matching condition to recognise amd-pstate active mode
driver.

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Tested-by: Perry Yuan <Perry.Yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: wkarny

tools/power/cpupower/utils/helpers/misc.c

@@ -95,7 +95,7 @@ bool cpupower_amd_pstate_enabled(void)
 	if (!driver)
 		return ret;
 
-	if (!strcmp(driver, "amd-pstate"))
+	if (!strncmp(driver, "amd", 3))
 		ret = true;
 
 	cpufreq_put_driver(driver);