board: imx6dl_mamoj: set the value for CSF size

Default value is too high and it covers the worst case. SPL for
imx6dl_mamoj becomes too big and cannot fit into the OCRAM, but CSF size
can be reduced.
Signed-off-by: NStefano Babic <sbabic@denx.de>
CC: Jagan Teki <jagan@amarulasolutions.com>
CC: Breno Lima <breno.lima@nxp.com>

configs/imx6dl_mamoj_defconfig

@@ -4,6 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x17800000
 CONFIG_SECURE_BOOT=y
 CONFIG_TARGET_MX6DL_MAMOJ=y
 CONFIG_NR_DRAM_BANKS=1
+CONFIG_CSF_SIZE=0x2060
 # CONFIG_CMD_BMODE is not set
 CONFIG_SPL_TEXT_BASE=0x00908000
 CONFIG_DISTRO_DEFAULTS=y