Don't log HPFAR on data fault from EL2.
Don't log HPFAR on data fault from EL2.

HPFAR_EL2 is only valid after a fault on a stage 2 translation so is not
valid for an EL2 fault as stage 2 translation is not being used.

Change-Id: I06550d92027c1f3e7cc0d29af94793ea6fd70a57

project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification