arm: imx6: tqma6: add support for TQMa6DL variant

This adds support for TQMa6DL using i.MX6DL and 1GiB DRAM
Since The module will use the same devicetree, we patch
the ram size in ft_board_setup.

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
diff --git a/board/tqc/tqma6/README b/board/tqc/tqma6/README
index 2c012e7..c47cb21 100644
--- a/board/tqc/tqma6/README
+++ b/board/tqc/tqma6/README
@@ -21,6 +21,7 @@
 
 x is a placeholder for the CPU variant
 q - means i.MX6Q/D: TQMa6Q (i.MX6Q) and TQMa6D  (i.MX6D)
+dl - means i.MX6DL: TQMa6DL  (i.MX6DL)
 s - means i.MX6S: TQMa6S  (i.MX6S)
 
 baseboard is a placeholder for the boot device
@@ -31,5 +32,7 @@
 
 tqma6q_mba6_mmc_config
 tqma6q_mba6_spi_config
+tqma6dl_mba6_mmc_config
+tqma6dl_mba6_spi_config
 tqma6s_mba6_mmc_config
 tqma6s_mba6_spi_config