powerpc/wsp: drop "select PPC_WSP_COPRO"

There is no Kconfig symbol PPC_WSP_COPRO. The select statement for it is
a nop. Drop it.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

arch/powerpc/platforms/wsp/Kconfig

@@ -9,7 +9,6 @@ config PPC_WSP
 	select PCI
 	select PPC_IO_WORKAROUNDS if PCI
 	select PPC_INDIRECT_PIO if PCI
-	select PPC_WSP_COPRO
 	default n
 
 menu "WSP platform selection"