doc: board: qemu-ppce500: Update supported and unsupported

qemu can emulate also e500v1 core but cannot emulate CPUs from Freescale
PowerPC QorIQ T and P series.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
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