efi: Replace GPL license boilerplate with SPDX headers

Replace all GPL license blurbs with an equivalent SPDX header (most
files are GPLv2, some are GPLv2+). While at it, drop some outdated
header changelogs as well.

Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: AKASHI Takahiro <[email protected]>
Cc: Alexander Graf <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Heinrich Schuchardt <[email protected]>
Cc: Jeffrey Hugo <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Leif Lindholm <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: Peter Jones <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sai Praneeth Prakhya <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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