[U-Boot] ORIGEN: fix needed for out-of-tree build

[Wolfgang Denk]

Dear Chander, when building the "origen" board out-of-tree, it
poollutes the source directory with a file
board/samsung/origen/tools/mkorigenspl.exe
which then never gets cleaned up.

Please fix your Makefile for out-of-tree building.


Side-note:  Why is this file called ".exe"?  Is this some MSDOS
executable or what?   Please consider also fixing the name.


Thanks.

Best regards,

Wolfgang Denk

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