usb: typec: ucsi: Add support for READ_POWER_LEVEL command

Add support for UCSI READ_POWER_LEVEL command as per
UCSI specification v2.1 and above to debugfs.

Following power related fields will be exposed as files in debugfs:-
peak_current (Peak current),
avg_current (Average current) and
vbus_voltage (VBUS voltage)

These files will be updated either when a READ_POWER_LEVEL
command is sent from OS or when a device is connected.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Venkat Jayaraman <venkat.jayaraman@intel.com>
Link: https://lore.kernel.org/r/20250814163028.18058-1-venkat.jayaraman@intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>