Replace WriteBuffer_Drain ARMop with a suite of memory barrier ARMops
Detail: - Docs/HAL/ARMop_API - Updated with documentation for the new ARMops. - s/ARMops - Set up pointers for the new memory barrier ARMops. Add full implementations for ARMv6 & ARMv7; older architectures should be able to get by with a mix of null ops & write buffer drain ops. Update ARMopPtrTable to validate structure against the list in hdr/OSMisc - hdr/KernelWS - Reserve workspace for new ARMops. Free up a bit of space by limiting ourselves to 2 cache levels with ARMv7. Remove some unused definitions. - hdr/OSMisc - New header defining OS_PlatformFeatures & OS_MMUControl reason codes, OS_PlatformFeatures 0 flags, and OS_MMUControl 2 ARMop indices - Makefile - Add export rules for OSMisc header - hdr/ARMops, s/ARM600, s/VMSAv6 - Remove CPUFlag_* and MMUCReason_* definitions. Update OS_MMUControl write buffer drain to use DSB_ReadWrite ARMop (which is what most existing write buffer drain implementations have been renamed to). - s/GetAll - Get Hdr:OSMisc - s/Kernel - Use OS_PlatformFeatures reason code symbols - s/vdu/vdudecl - Remove unused definition Admin: Tested on ARM11, Cortex-A8, Cortex-A9 Version 5.35, 22.214.171.1249. Tagged as 'Kernel-5_35-4_79_2_279'
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