usb: phy: phy-ab8500-usb: fix spello of "function"

Fix typo/spello of "function".

Cc: Felipe Balbi <balbi@kernel.org>
Cc: Jiri Kosina <trivial@kernel.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/1be7e71f-6b79-290a-f38e-b51ccaf85e8e@infradead.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>