[POWERPC] Fix mv64x60 early console code to use cell-index property
[POWERPC] Fix mv64x60 early console code to use cell-index property

The MPSC driver and prpmc2800.dts have been modified to use property
'cell-index' as the serial port number, but the early serial console
driver for the mv64x60 has not been modified to use this new property.
This fixes it.

Signed-off-by: d1590872a615bd0d1ab8a3040c0e78cd1f32c415@slac.stanford.edu)
Acked-by: Dale Farnsworth <80b24d51bbcd1ba9a2ce6b5fe97e28c44f9ff374@farnsworth.org>
Signed-off-by: Paul Mackerras <19a0ba370c443ba08d20b5061586430ab449ee8c@samba.org>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas