soc: qcom: Add Sleep stats driver

Let's add a driver to read the stats from remote processor and
export to debugfs.

The driver creates "qcom_sleep_stats" directory in debugfs and
adds files for various low power mode available. Below is sample
output with command

cat /sys/kernel/debug/qcom_sleep_stats/ddr
count = 0
Last Entered At = 0
Last Exited At = 0
Accumulated Duration = 0

Signed-off-by: Mahesh Sivasubramanian <[email protected]>
Signed-off-by: Lina Iyer <[email protected]>
[mkshah: add subsystem sleep stats, create one file for each stat]
Signed-off-by: Maulik Shah <[email protected]>
Tested-by: Shawn Guo <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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