arm: mx6: tqma6: CPU type selection via Kconfig

This is the first patch to remove the
CONFIG_SYS_EXTRA_OPTIONS.

This patch implements CPU type selection from Kconfig.
Further Kconfig stuff is added later.

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
diff --git a/board/tqc/tqma6/Kconfig b/board/tqc/tqma6/Kconfig
index f8b3d1f..3e4d9f5 100644
--- a/board/tqc/tqma6/Kconfig
+++ b/board/tqc/tqma6/Kconfig
@@ -12,4 +12,25 @@
 config SYS_CONFIG_NAME
 	default "tqma6"
 
+choice
+	prompt "TQMa6 SoC variant"
+	default TQMA6Q
+	help
+	  select the TQMa6 module variant. The variants differing in the used
+	  i.MX6 CPU type and DRAM
+
+config TQMA6Q
+	bool "TQMa6Q / TQMa6D"
+	select MX6Q
+	help
+	  select TQMa6Q / TQMa6D with i.MX6Q/D and 1GiB DRAM
+
+config TQMA6S
+	bool "TQMa6S"
+	select MX6S
+	help
+	  select TQMa6S with i.MX6S and 512 MiB DRAM
+
+endchoice
+
 endif