arm: mx6: add support for Compulab cm-fx6 CoM

Add initial support for Compulab CM-FX6 CoM.
Support includes MMC, SPI flash, and SPL with dynamic DRAM detection.

Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tom Rini <trini@ti.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 22f0f09..f933123 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -424,6 +424,9 @@
 config RMOBILE
 	bool "Renesas ARM SoCs"
 
+config TARGET_CM_FX6
+	bool "Support cm_fx6"
+
 config TARGET_S5P_GONI
 	bool "Support s5p_goni"
 
@@ -579,6 +582,7 @@
 source "board/cm4008/Kconfig"
 source "board/cm41xx/Kconfig"
 source "board/compulab/cm_t335/Kconfig"
+source "board/compulab/cm_fx6/Kconfig"
 source "board/congatec/cgtqmx6eval/Kconfig"
 source "board/creative/xfi3/Kconfig"
 source "board/davedenx/qong/Kconfig"