Convert CONFIG_DMA_LPC32XX to Kconfig

This converts the following to Kconfig:
   CONFIG_DMA_LPC32XX

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index e81ae96..ff5b834 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -35,6 +35,16 @@
 	  This driver support data transfer from devices to
 	  memory and from memory to devices.
 
+config DMA_LPC32XX
+	bool "LPC32XX DMA driver"
+	select DMA_LEGACY
+	help
+	  Enable some legacy DMA code for lpc32xx. It provides some direct
+	  functions likes lpc32xx_dma_wait_status() which can be called from
+	  other code.
+
+	  This should be converted to use driver model and UCLASS_DMA.
+
 config TI_EDMA3
 	bool "TI EDMA3 driver"
 	select DMA_LEGACY
@@ -49,6 +59,7 @@
 	help
 	  Enable APBH DMA driver.
 
+
 if APBH_DMA
 config APBH_DMA_BURST
 	bool "Enable DMA BURST"