powerpc: add ps3 platform OS params support

Add support to access the parameter data from the ps3pf other OS area of flash memory. The parameter data mainly holds user preferences like static ip address, etc.

---
 arch/powerpc/platforms/ps3pf/Makefile  |    2 
 arch/powerpc/platforms/ps3pf/os-area.c |  259 +++++++++++++++++++++++++++++++++
 2 files changed, 260 insertions(+), 1 deletion(-)

Index: cell--common--6/arch/powerpc/platforms/ps3pf/Makefile
===================================================================
@@ -1,2 +1,2 @@
 obj-y += setup.o mm.o smp.o time.o hvcall.o htab.o repository.o
-obj-y += interrupt.o exports.o
+obj-y += interrupt.o exports.o os-area.o