imx: i.mx6q: imx6q_logic: Migrate to SPL and enable SDP

Since the vast majority of i.MX6 boards are migrating to SPL,
this patch converts im6q_logic to SPL and enables the SDP for
loading SPL and u-boot.img over USB.  The Falcon mode only
supports NAND flash as of now due to limited space/RAM, but
all i.MX6D/Q SOM's from Logic PD have internal NAND from which
to boot.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/arch/arm/mach-imx/mx6/Kconfig b/arch/arm/mach-imx/mx6/Kconfig
index 3c87ece..d4bc60a 100644
--- a/arch/arm/mach-imx/mx6/Kconfig
+++ b/arch/arm/mach-imx/mx6/Kconfig
@@ -205,6 +205,8 @@
 
 config TARGET_MX6LOGICPD
 	bool "Logic PD i.MX6 SOM"
+	select MX6Q
+	select SUPPORT_SPL
 	select BOARD_EARLY_INIT_F
 	select BOARD_LATE_INIT
 	select DM
@@ -213,7 +215,6 @@
 	select DM_I2C
 	select DM_MMC
 	select DM_PMIC
-	select DM_REGULATOR
 	select OF_CONTROL
 
 config TARGET_MX6MEMCAL