clang-format: Add architecture header group

Merged Darryl Green requested to merge github/fork/CJKay/master into master

Created by: CJKay

The first revision of .clang-format missed some necessary include grouping options for the recently-introduced architecture headers.

Change-Id: I92eeeb6ee94693d129502a1ddc873f77fb0b408d Signed-off-by: Chris Kay chris.kay@arm.com

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