iio: buffer: use upstream IIO HW consumer

This change removes ADI's HW consumer module and uses the upstream version.
Only the AXI ADC uses the old module, and now it points to the new one.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
(cherry picked from commit 9420999)

Author: commodo

drivers/iio/adc/Kconfig

@@ -281,7 +281,7 @@ config AT91_ADC
 config CF_AXI_ADC
 	tristate "Analog Devices High-Speed AXI ADC driver core"
 	select IIO_BUFFER
-	select IIO_HW_CONSUMER
+	select IIO_BUFFER_HW_CONSUMER
 	select IIO_BUFFER_DMAENGINE
 	help
 	  Say yes here to build support for Analog Devices AD9467 and AD9643,

drivers/iio/buffer/Kconfig

@@ -52,8 +52,3 @@ config IIO_TRIGGERED_BUFFER
 	select IIO_KFIFO_BUF
 	help
 	  Provides helper functions for setting up triggered buffers.
-
-config IIO_HW_CONSUMER
-	tristate
-	help
-	  Hardware consumer buffer

drivers/iio/buffer/Makefile

@@ -10,4 +10,3 @@ obj-$(CONFIG_IIO_BUFFER_DMAENGINE) += industrialio-buffer-dmaengine.o
 obj-$(CONFIG_IIO_BUFFER_HW_CONSUMER) += industrialio-hw-consumer.o
 obj-$(CONFIG_IIO_TRIGGERED_BUFFER) += industrialio-triggered-buffer.o
 obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
-obj-$(CONFIG_IIO_HW_CONSUMER) += hw_consumer.o