i386: populate floppy drive information in DSDT

i386: populate floppy drive information in DSDT

On x86-based systems Linux determines the presence and the type of
floppy drives via a query of a CMOS field.  So does SeaBIOS when
populating the return data for int 0x13 function 0x08.

However Windows doesn't do it. Instead, it requests this information
from BIOS via int 0x13/0x08 or through ACPI objects _FDE (Floppy Drive
Enumerate) and _FDI (Floppy Drive Information) of the floppy controller
object.  On UEFI systems only ACPI-based detection is supported.

QEMU doesn't provide those objects in its ACPI tables and as a result
floppy drives are invisible to Windows on UEFI/OVMF.

This patch adds those objects to the floppy controller in DSDT,
populating them with the information from respective QEMU objects.

Signed-off-by: Roman Kagan <[email protected]>
Cc: Igor Mammedov <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Marcel Apfelbaum <[email protected]>
Cc: John Snow <[email protected]>
Cc: Laszlo Ersek <[email protected]>
Cc: Kevin O'Connor <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>