efi: Decode IA32/X64 Context Info structure

efi: Decode IA32/X64 Context Info structure

Print the fields of the IA32/X64 Context Information structure.

Print the "Register Array" as raw values. Some context types are defined
in the UEFI spec, so more detailed decoded may be added in the future.

Based on UEFI 2.7 section N.2.4.2.2 IA32/X64 Processor Context
Information Structure.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180504060003.19618-11-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>