hw/i386: move isapc machine to separate isapc.c file

Now that pc_init_isa() is independent of any PCI initialisation, move it into a
separate isapc.c file including the ISA IDE variables which are now no longer
needed for the pc-i440fx machine. This enables us to finally fix the dependency
of ISAPC on I440FX in hw/i386/Kconfig.

Note that as part of the move to a separate file we can see that the licence text
is a verbatim copy of the MIT licence. The text originates from commit 1df912cf9e
("VL license of the day is MIT/BSD") so we can be sure that this was the original
intent. As a consequence we can update the file header to use a SPDX tag as per
the current project contribution guidelines.

Signed-off-by: Mark Cave-Ayland <mark.caveayland@nutanix.com>
Reviewed-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250828111057.468712-17-mark.caveayland@nutanix.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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