soc: qcom: kryo-l2-accessors: Add debugfs support

It is useful to check system register configuration on
a device without having to attach a debugger. Add
support for a debugfs interface that will allow this.

Change-Id: I2a8f7cd0f1f49e4750eb3d3b7b928b1b0baff190
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>