USB: u132-hcd.c - Fix a warning when CONFIG_PM=n

I noticed this warning with CONFING_PM=n 

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drivers/usb/host/u132-hcd.c:1525: warning: 'port_power' defined but not used

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Signed-off-by: Gabriel Craciunescu <nix.or.die@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>