fdt: Remove duplicate code

fdt: Remove duplicate code

Commit 6d29cc7dcf2d ("fdt: Fixup only valid memory banks") ended up
being merged twice, first as:

	commit 6d29cc7dcf2d35966aa0b6119fd1cbca0d21d5e6
	Author:     Thierry Reding <[email protected]>
	AuthorDate: Tue Jan 30 11:34:17 2018 +0100
	Commit:     Simon Glass <[email protected]>
	CommitDate: Sun Feb 18 12:53:38 2018 -0700

	    fdt: Fixup only valid memory banks

	    Memory banks with address 0 and size 0 are empty and should not be
	    passed to the OS via device tree.

	    Signed-off-by: Thierry Reding <[email protected]>
	    Acked-by: Stephen Warren <[email protected]>
and later again, though this time it was v2:

	commit ed5af03f9bb8905f1e94d68ab49f22d7f061d75f
	Author:     Thierry Reding <[email protected]>
	AuthorDate: Thu Feb 15 19:05:59 2018 +0100
	Commit:     Tom Rini <[email protected]>
	CommitDate: Fri Feb 23 10:40:50 2018 -0500

	    fdt: Fixup only valid memory banks

	    Memory banks with address 0 and size 0 are empty and should not be
	    passed to the OS via device tree.

	    Acked-by: Stephen Warren <[email protected]>
	    Signed-off-by: Thierry Reding <[email protected]>
The second version was slightly different, so the main hunk of the patch
was applied twice. This isn't harmful because the code is idempotent,
but it's wasteful to run the same code twice.

Signed-off-by: Thierry Reding <[email protected]>
Reviewed-by: Simon Glass <[email protected]>