Use the minimum cache line size when flushing the cache.
Use the minimum cache line size when flushing the cache.

CTR_EL0 holds the minimum data cache line size which is what we need to
ensure all data to written back to memory. Previously, only the line
size for a specific cache was used and which cache that was wasn't even
being selected.

Change-Id: Id67e9efba61775b9b21591bb80a7855af472704c

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