drivers: group DW configs in one Kconfig file

It is better to have company/family related features grouped.

Signed-off-by: Janusz Jankowski <janusz.jankowski@linux.intel.com>

Kconfig

@@ -61,18 +61,10 @@ config MEM_WND
 	bool
 	default n
 
-config DW_SPI
-	bool
-	default n
-
 config INTEL_IOMUX
 	bool
 	default n
 
-config DW_GPIO
-	bool
-	default n
-
 config HW_LLI
 	bool
 	default n

src/drivers/Kconfig

@@ -4,17 +4,6 @@ menu "Drivers"
 
 source "src/drivers/intel/cavs/Kconfig"
 
-config DW
+source "src/drivers/dw/Kconfig"
-	bool
-	default n
-	help
-	  This has to be selected if platform supports Designware features.
-
-config DW_DMA
-	bool "Designware DMA driver"
-	depends on DW
-	default n
-	help
-	  Select this to enable support for the Designware DMA controller.
 
 endmenu # "Drivers"

src/drivers/dw/Kconfig

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+config DW
+	bool
+	default n
+	help
+	  This has to be selected if platform supports Designware features.
+
+if DW
+
+config DW_DMA
+	bool "Designware DMA driver"
+	default n
+	help
+	  Select this to enable support for the Designware DMA controller.
+
+config DW_SPI
+	bool
+	default n
+
+config DW_GPIO
+	bool
+	default n
+
+endif # DW