firmware: arm_scmi: Fix up turbo frequencies selection

Sustained frequency when greater than or equal to 4Ghz on 64-bit devices
currently result in marking all frequencies as turbo. Address the turbo
frequency selection bug by fixing the truncation.

Fixes: a897575 ("firmware: arm_scmi: Add support for marking certain frequencies as turbo")
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Message-Id: <20250514214719.203607-1-quic_sibis@quicinc.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Author: Sibi Sankar

drivers/firmware/arm_scmi/perf.c

@@ -892,7 +892,7 @@ static int scmi_dvfs_device_opps_add(const struct scmi_protocol_handle *ph,
 			freq = dom->opp[idx].indicative_freq * dom->mult_factor;
 
 		/* All OPPs above the sustained frequency are treated as turbo */
-		data.turbo = freq > dom->sustained_freq_khz * 1000;
+		data.turbo = freq > dom->sustained_freq_khz * 1000UL;
 
 		data.level = dom->opp[idx].perf;
 		data.freq = freq;