pcmcia: move Vpp setup to struct pcmcia_device

pcmcia: move Vpp setup to struct pcmcia_device

Some drivers prefer to explicitly set Vpp. Instead of passing the
voltage inside config_req_t, store it in struct pcmcia_device.

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Acked-by: Gustavo F. Padovan <[email protected]> (for drivers/bluetooth)
Tested-by: Wolfram Sang <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>