hw/char/serial.h: Extract serial-isa.h

The includes where updated based on compile errors. Now, the inclusion of the
header roughly matches Kconfig dependencies:

# grep -r -e "select SERIAL_ISA"

hw/char/serial.h: Extract serial-isa.h

The includes where updated based on compile errors. Now, the inclusion of the
header roughly matches Kconfig dependencies:

# grep -r -e "select SERIAL_ISA"
hw/ppc/Kconfig: select SERIAL_ISA
hw/isa/Kconfig: select SERIAL_ISA
hw/sparc64/Kconfig: select SERIAL_ISA
hw/i386/Kconfig: select SERIAL_ISA
hw/i386/Kconfig: select SERIAL_ISA # for serial_hds_isa_init()

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Link: https://lore.kernel.org/r/20240905073832.16222-3-shentey@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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