i#5475 Add FEATURE_LOR for AArch64 v8.1 #5567
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The Limited Ordering Regions feature is required for the v8.1
load-acquire and store-release instructions like LDLAR and STLLR which
rely on the hardware providing order between memory accesses to
regions of the physical address map. Read from ID_AA64MMFR1_EL1.
Issues: #5475, #1569