iio: Rename iio/dds to iio/frequency

Generalize naming to allow other frequency synthesis techniques as well.
No functional changes.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/iio/Kconfig
Simple merge

diff --cc drivers/staging/iio/Makefile
Simple merge

diff --cc drivers/staging/iio/frequency/Kconfig
Simple merge

diff --cc drivers/staging/iio/frequency/Makefile
Simple merge

diff --cc drivers/staging/iio/frequency/ad5930.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9832.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9832.h
Simple merge

diff --cc drivers/staging/iio/frequency/ad9834.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9834.h
Simple merge

diff --cc drivers/staging/iio/frequency/ad9850.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9852.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9910.c
Simple merge

diff --cc drivers/staging/iio/frequency/ad9951.c
Simple merge

diff --cc drivers/staging/iio/frequency/dds.h
Simple merge