A7-A11 SoC support

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Add support for A7-A11 SoCs found in various iPhones, iPads, iPod touches and Apple TVs.

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Changes:

• Register names are now upper cased
• EL3 stack is now before main stack, and does not have STACKBOT magic anymore.
• is_idevice() is replaced by is_mac, cpufeat_fast_ipi and cpufeat_mmu_sprr, or removed entirely when not needed.
  • supports_fipi() removed as well
• Use macros like S5L8960X for all chip_id comparisons
• For SMP start offset macros, always use the first SoC with that offset in the macro name.
• PAN in exception handler now remains unchanged in code but get patched to NOP during init on non-PAN devices.
• Use common code to parse iBoot versions
• Add comma to EL list to keep format sane