Convert CONFIG_SPL_RAM_DEVICE to defconfig

This converts the following to Kconfig:
  CONFIG_SPL_RAM_DEVICE

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>

common/spl/Kconfig

@@ -449,6 +449,15 @@ config SPL_POWER_SUPPORT
 	  in drivers/power, drivers/power/pmic and drivers/power/regulator
 	  as part of an SPL build.
 
+config SPL_RAM_DEVICE
+	bool "Support booting from preloaded image in RAM"
+	depends on SPL
+	default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
+	help
+	  Enable booting of an image already loaded in RAM. The image has to
+	  be already in memory when SPL takes over, e.g. loaded by the boot
+	  ROM.
+
 config SPL_SATA_SUPPORT
 	bool "Support loading from SATA"
 	depends on SPL

include/configs/microblaze-generic.h

@@ -283,7 +283,6 @@
 
 #define CONFIG_SPL_LDSCRIPT	"arch/microblaze/cpu/u-boot-spl.lds"
 
-#define CONFIG_SPL_RAM_DEVICE
 #ifdef CONFIG_SYS_FLASH_BASE
 # define CONFIG_SYS_UBOOT_BASE		CONFIG_SYS_FLASH_BASE
 #endif

include/configs/socfpga_common.h

@@ -306,7 +306,6 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
  * 0xFFFF_FF00 ...... End of SRAM
  */
 #define CONFIG_SPL_FRAMEWORK
-#define CONFIG_SPL_RAM_DEVICE
 #define CONFIG_SPL_TEXT_BASE		CONFIG_SYS_INIT_RAM_ADDR
 #define CONFIG_SPL_MAX_SIZE		(64 * 1024)
 

include/configs/tegra-common.h

@@ -98,7 +98,6 @@
 
 /* Defines for SPL */
 #define CONFIG_SPL_FRAMEWORK
-#define CONFIG_SPL_RAM_DEVICE
 #define CONFIG_SPL_BOARD_INIT
 #define CONFIG_SPL_NAND_SIMPLE
 #define CONFIG_SPL_MAX_FOOTPRINT	(CONFIG_SYS_TEXT_BASE - \

include/configs/xilinx_zynqmp.h

@@ -288,7 +288,6 @@
 
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SPL_BOARD_INIT
-#define CONFIG_SPL_RAM_DEVICE
 
 /* u-boot is like dtb */
 #define CONFIG_SPL_FS_LOAD_ARGS_NAME	"u-boot.bin"

include/configs/zynq-common.h

@@ -290,7 +290,6 @@
 #define CONFIG_CMD_SPL
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SPL_BOARD_INIT
-#define CONFIG_SPL_RAM_DEVICE
 
 #define CONFIG_SPL_LDSCRIPT	"arch/arm/mach-zynq/u-boot-spl.lds"