dt-bindings: usb: phy: nop: Fix a typo ("specifiy")

Spell it correctly as "specify".

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230129124258.1295503-1-j.neuschaefer@gmx.net


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