Remove IO_MEM_SUBWIDTH.
Greatly simplify the subpage implementation by not supporting multiple devices at the same address at different widths. We don't need full copies of mem_read/mem_write/opaque for each address, only a single index back into the main io_mem_* arrays. Signed-off-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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