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H A Dpmap-v6.cdiff 291492 Mon Nov 30 15:18:52 MST 2015 mmel ARM: create new memory attribute for writethrough cacheable memory.
- add new TEX class for WT cacheable memory
- export new TEX class to kernel as VM_MEMATTR_WT attribute
- add new aliases VM_MEMATTR_WRITE_COMBINING and
VM_MEMATTR_WRITE_BACK, it's used in DRM code

Note:
Only Cortex A8 supports WT caching in HW. On rest of Cortex CPUs,
WT requests is treated as uncacheable.

Approved by: kib (mentor)

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