[POWERPC] Move I8259 selection under MPC8641HPCN board

Signed-off-by: Jon Loeliger <jdl@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -794,7 +794,6 @@ config GENERIC_ISA_DMA
 
 config PPC_I8259
 	bool
-	default y if MPC8641_HPCN
 	default n
 
 config PPC_INDIRECT_PCI

arch/powerpc/platforms/86xx/Kconfig

@@ -7,6 +7,7 @@ choice
 
 config MPC8641_HPCN
 	bool "Freescale MPC8641 HPCN"
+	select PPC_I8259
 	help
 	  This option enables support for the MPC8641 HPCN board.