uwb: i1480: remove MAC/PHY information checking function

Some hardware/firmware combinations (most notably an IOGear HWA using the i1480
firmware) kill the host controller after issuing a GET_MAC_PHY_INFO command.
Removing this check seems harmless otherwise.

The patch fixes the issue where the HC is killed, showing the message:

ehci_hcd 0000:00:1d.7: HC died; cleaning up

After this error, USB comes back only after reloading the ehci_hcd module.

Signed-off-by: Anderson Lizardo <anderson.lizardo@indt.org.br>
Signed-off-by: David Vrabel <david.vrabel@csr.com>