redhat: modify efiuki specfile changes to use variants convention

Clark Williamsrequested to merge
clrkwllms/kernel-ark:os-build-with_efiuki into os-build

Specfile variables used to enable/disable variants use the 'with_' and without_ naming convention.

Change the efiuki variant changes to use a with_efiuki variable for conditional builds.

Signed-off-by: Clark Williams williams@redhat.com

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