block: Handle "rechs" and "large" translation options

block: Handle "rechs" and "large" translation options

Sure, CHS translation is an obscure topic, and legacy options for
hard-disk geometries are obscure as well.  But since QEMU does nothing
with it except telling the BIOS, and since there "large" and "rechs"
are listed in the enums, parsing them seems to be the bare minimum.

Acked-by: Stefan Hajnoczi <[email protected]>
Reviewed-by: Igor Mammedov <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Andreas Färber <[email protected]>