usb: phy: mxs: Staticize mxs_charger_secondary_detection()
mxs_charger_secondary_detection() is only used in this file, so make it static. This fixes the following sparse warning: drivers/usb/phy/phy-mxs-usb.c:581:23: warning: symbol 'mxs_charger_secondary_detection' was not declared. Should it be static? Acked-by: NJun Li <jun.li@nxp.com> Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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