hw/block/Kconfig: FDC must not use I8257 with SUN4M

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/ide/Kconfig: AHCI must depend on PCI

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/sd/Kconfig: Add OMAP to select SD

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>