[MIPS] TXx9: Reorganize PCI code

Split out PCIC dependent code and SoC dependent code from board dependent
code.  Now TX4927 PCIC code is independent from TX4927/TX4938 SoC code.
Also fix some build problems on CONFIG_PCI=n.

As a bonus, "FPCIB0 Backplane Support" is available for all TX39/TX49 boards
and PCI66 support is available for all TX49 boards.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/txx9/generic/Makefile b/arch/mips/txx9/generic/Makefile
index 8cb4a7e..b80b6e0 100644
--- a/arch/mips/txx9/generic/Makefile
+++ b/arch/mips/txx9/generic/Makefile
@@ -2,6 +2,8 @@
 # Makefile for common code for TXx9 based systems
 #
 
+obj-y	+= setup.o
+obj-$(CONFIG_PCI)	+= pci.o
 obj-$(CONFIG_TOSHIBA_RBTX4927)	+= mem_tx4927.o irq_tx4927.o
 obj-$(CONFIG_TOSHIBA_RBTX4938)	+= mem_tx4938.o irq_tx4938.o
 obj-$(CONFIG_TOSHIBA_FPCIB0)	+= smsc_fdc37m81x.o