soc: qcom: qcom_stats: Add QMP support for syncing ddr stats

soc: qcom: qcom_stats: Add QMP support for syncing ddr stats

Recent SoCs (SM8450 onwards) require QMP command to be sent before reading
ddr stats. The duration field of ddr stats will get populated only if QMP
command is sent.

Add support to send ddr stats freqsync QMP command.

Signed-off-by: Maulik Shah <maulik.shah@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250611-ddr_stats_-v5-2-24b16dd67c9c@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>