x86/EFI: drop stale section special casing when generating base relocs

x86/EFI: drop stale section special casing when generating base relocs

As of commit a6066af5b142 ("xen/init: Annotate all command line
parameter infrastructure as const") .init.setup has been part of .init.
As of commit 544ad7f5caf5 ("xen/init: Move initcall infrastructure into
.init.data") .initcall* have been part of .init. Hence neither can be
encountered as a stand-alone section in the final binaries anymore.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>