iio: frequency: adf4350: fix an initialization

Sparse complains about this:
drivers/iio/frequency/adf4350.c:58:29: warning: Initializer entry defined twice
drivers/iio/frequency/adf4350.c:59:10:   also defined here

It looks like '|' was intended here instead of ','.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>