board: engicam: Attach i.MX6 common code

The existing common code for Engicam boards uses i.MX6,
so attach that into i.MX6 Engicam boards so-that adding
new SoC variants of Engicam boards become meaningful.

Add support for it.

Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>
diff --git a/board/engicam/common/Kconfig b/board/engicam/common/Kconfig
new file mode 100644
index 0000000..38328fd
--- /dev/null
+++ b/board/engicam/common/Kconfig
@@ -0,0 +1,8 @@
+config IMX6_ENGICAM_COMMON
+	bool "Engicam i.MX6 Common code"
+	depends on SPL && MX6
+	default y if TARGET_MX6Q_ENGICAM || TARGET_MX6UL_ENGICAM
+	help
+	  Common SPL and U-Boot proper code for Engicam i.MX6 targets.
+
+	  Enable it in board Kconfig if it uses i.MX6 variant Engicam boards.