[RFA] Patch to conform to Power ISA 2.06

[Edmar Wienskoski-RA8797]

Freescale would like to contribute this patch to binutils.
We would like to request a PowerPC maintainer to review and commit the
patch since we have no CVS write permissions.

Recently, Power.org released the ISA 2.06 in which the wait instruction
has a 2 bit unsigned argument. The form: "wait 0" is equivalent to the 
old form: "wait".

This patch adds a 2 bit unsigned argument as an optional argument to the
wait instruction, keeping it backward compatible.

Dejagnu tests were performed in a e500mc target using a G5 as a host with
no regressions.

Thanks,
Edmar

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