Features/Intel|Platforms/Intel: Complete pending changes to [Components.{ARCH}]

As noted in the code, it was intended to update various manually specified
instances of [Components.IA32/X64] to [Components.$(DXE_ARCH)] or
[Components.$(PEI_ARCH)] as appropriate, once macro expansion in the
Components {ARCH} value was supported.

This support was added some time ago[1], but the marked changes were never
made.

[1]: https://bugzilla.tianocore.org/show_bug.cgi?id=2308



Signed-off-by: Mike Beaton <mjsbeaton@gmail.com>