sim cris: Unbreak --disable-sim-hardware builds

With --disable-sim-hardware (--enable-sim-hardware=no),
whose default was changed to --enable-sim-hardware(=yes) in
commit 34cf51120683, building for cris-elf fails as
sim_hw_parse then doesn't exist.

A cris-elf simulator configured for --enable-sim-hardware
(or the default after to the mentioned commit) runs about
2.5x slower than one configured --disable-sim-hardware.
A further 2-5% performance regression was not investigated.

When sim_hw_parse doesn't exist, --cris-900000xx can't be
supported.  The best action here is to remove it completely,
so its absence can be identified through --help, but
avoiding littering the code with "#if WITH_HW".

sim/cris:
	* sim-if.c (cris_options) [WITH_HW]: Conditionalize
	support of option --cris-900000xx.
	(sim_open) [WITH_HW]: Conditionalize sim_hw_parse
	call.

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