[PATCH] enable RTAS /proc for PowerPC/CHRP platform

This patch enables RTAS /proc support for PowerPC 32bits / CHRP platform.

A new entry is created (/proc/ppc/rtas/) which contains the RTAS nodes. 
Theses nodes and the code are the exact same than with the ppc64 
architecture.

This patch has been succefully applied on the kernel 2.6.18.1 and tested 
on bPlan's OpenFirmware.

Signed-off-by: Nicolas DET <redacted>