soc: qcom: add kryo_e76 debugfs node

To disable and enable Kryo hardware errata 76 workaround at
runtime, expose a debugfs interface. Wrote codes using e74/e76
API and data as a starting point.

/sys/kernel/debug/scm_errata/kryo_e76
This allows Kryo errata 76 workaround to be toggled
off or on (on affected devices) by echoing 0 or 1 to the file.

Change-Id: I3d682021aa98eef5421ac2e7578da02f2ea98081
Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org>