arm: am57xx: cl-som-am57x: add initial board support

Features supported :

* Serial console
* SPI Flash
* MMC/SD Card
* eMMC storage
* SATA
* PCA9555 - GPIO expander over I2C5 bus
* USB

Use spl alternate boot device feature to define fallback to
the main boot device as it is defined by hardware.

Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
[uri.mashiach@compulab.co.il: Adjust to v2016.11]
Signed-off-by: Uri Mashiach <uri.mashiach@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
diff --git a/arch/arm/mach-omap2/omap5/Kconfig b/arch/arm/mach-omap2/omap5/Kconfig
index 018e584..242d1ee 100644
--- a/arch/arm/mach-omap2/omap5/Kconfig
+++ b/arch/arm/mach-omap2/omap5/Kconfig
@@ -40,6 +40,9 @@
 	prompt "OMAP5 board select"
 	optional
 
+config TARGET_CL_SOM_AM57X
+	bool "CompuLab CL-SOM-AM57x"
+
 config TARGET_CM_T54
 	bool "CompuLab CM-T54"
 
@@ -179,6 +182,7 @@
 endmenu
 endif
 
+source "board/compulab/cl-som-am57x/Kconfig"
 source "board/compulab/cm_t54/Kconfig"
 source "board/ti/omap5_uevm/Kconfig"
 source "board/ti/dra7xx/Kconfig"