Add an SPMI debug device and associated PMIC child devices for the
primary SPMI interface. This provides consumers with unrestricted
access to the PMIC registers on pre-production devices. This helps
to simplify debugging.
Change-Id: I920a3655e0e257ee819c7227e154d27ee43f3250
Signed-off-by: David Collins <quic_collinsd@quicinc.com>