ram: add SDRAM driver for i.MXRT SoCs

Add SDRAM driver for i.MXRT SoCs.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
diff --git a/drivers/ram/Kconfig b/drivers/ram/Kconfig
index b454ceb..56fea7c 100644
--- a/drivers/ram/Kconfig
+++ b/drivers/ram/Kconfig
@@ -65,5 +65,13 @@
 	  Enabling this config adds support for the DDR memory controller
 	  on J721E family of SoCs.
 
+config IMXRT_SDRAM
+	bool "Enable i.MXRT SDRAM support"
+	depends on RAM
+	help
+	  i.MXRT family devices support smart external memory controller(SEMC)
+	  to support external memories like sdram, psram & nand.
+	  This driver is for the sdram memory interface with the SEMC.
+
 source "drivers/ram/rockchip/Kconfig"
 source "drivers/ram/stm32mp1/Kconfig"