powerpc/mpc5xxx: add OF platform binding doc for FSL MSCAN devices

powerpc/mpc5xxx: add OF platform binding doc for FSL MSCAN devices

From net-next-2.6 commit 932a3bca9a21c05a856891921d0164b5f0dcbff7

This patch adds documentation for the MSCAN OF device bindings for
the MPC512x and moves the one for the MPC5200 to the new common file
"Documentation/powerpc/dts-bindings/fsl/can.txt".

Signed-off-by: Wolfgang Grandegger <wg@denx.de>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
git-svn-id: svn://svn.berlios.de//socketcan/trunk@1106 030b6a49-0b11-0410-94ab-b0dab22257f2