Re-scan bus for ata controllers

[Paul Goyette <paul%whooppee.com@localhost>]

Is drvctl supposed to work for ata controllers?

I've got

        {149} dmesg | grep -e '^ahcisata' -e '^atabus0'
        ahcisata0 at pci0 dev 17 function 0: vendor 0x1002 product 0x4391
        ahcisata0: interrupting at ioapic0 pin 22
        ahcisata0: 64-bit DMA
        ahcisata0: AHCI revision 1.1, 6 ports, 32 command slots, features 
0xf722e080
        atabus0 at ahcisata0 channel 0
        ahcisata0 port 0: device present, speed: 3.0Gb/s
        ahcisata0 port 3: device present, speed: 3.0Gb/s
        ahcisata0 port 4: device present, speed: 3.0Gb/s
        ahcisata0 port 5: device present, speed: 1.5Gb/s
        {150}

and drvctl reports errors:

        {150} drvctl -p /dev/atabus0
        drvctl: get-properties: No such process
        {151} drvctl -r /dev/atabus0
        drvctl: DRVRESCANBUS: Device not configured
        {152}

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