arm: imx6: tqma6: implement KConfig baseboard selection

this finally removes the need for extra settings in
defconfig

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>

board/tqc/tqma6/Kconfig

@@ -52,6 +52,20 @@ config TQMA6X_SPI_BOOT
 
 endchoice
 
+choice
+	prompt "TQMa6 base board variant"
+	default MBA6
+	help
+	  Select base board for TQMa6
+
+config MBA6
+	bool "TQMa6 on MBa6 Starterkit"
+	help
+	  Select the MBa6 starterkit. This features a GigE Phy, USB, SD-Card
+	  etc.
+
+endchoice
+
 config IMX_CONFIG
 	default "board/tqc/tqma6/tqma6q.cfg" if TQMA6Q
 	default "board/tqc/tqma6/tqma6s.cfg" if TQMA6S

configs/tqma6q_mba6_mmc_defconfig

 CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_TQMA6=y
-CONFIG_SYS_EXTRA_OPTIONS="MBA6"
 CONFIG_CMD_SETEXPR=y
 CONFIG_CMD_NET=y

configs/tqma6q_mba6_spi_defconfig

@@ -2,6 +2,5 @@ CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_TQMA6=y
 CONFIG_TQMA6X_SPI_BOOT=y
-CONFIG_SYS_EXTRA_OPTIONS="MBA6"
 CONFIG_CMD_SETEXPR=y
 CONFIG_CMD_NET=y

configs/tqma6s_mba6_mmc_defconfig

@@ -2,6 +2,5 @@ CONFIG_ARM=y
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_TQMA6=y
 CONFIG_TQMA6S=y
-CONFIG_SYS_EXTRA_OPTIONS="MBA6"
 CONFIG_CMD_SETEXPR=y
 CONFIG_CMD_NET=y

configs/tqma6s_mba6_spi_defconfig

@@ -3,6 +3,5 @@ CONFIG_ARCH_MX6=y
 CONFIG_TARGET_TQMA6=y
 CONFIG_TQMA6S=y
 CONFIG_TQMA6X_SPI_BOOT=y
-CONFIG_SYS_EXTRA_OPTIONS="MBA6"
 CONFIG_CMD_SETEXPR=y
 CONFIG_CMD_NET=y