imx6ul: geam: Fix fdt_file mismatch

fdt_file is looking for imx6ul-geam-kit.dtb but Linux
has imx6ul-geam.dtb, since Linux skipped -kit on file name
by below commit.
"ARM: dts: imx6ul-geam: Skip suffix -kit from dts name"
(sha1: 182de5ebce71e469cfa686fcdf08c9cbe11ece97)

So, due to this mismatch U-Boot failed to pick the
proper dtb which eventually break the Linux boot.

This patch fixed this mismatch by
- renaming dts files
- update config option to use new dtb file
- update fdt_file to new dtb file name

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/configs/imx6ul_geam_mmc_defconfig b/configs/imx6ul_geam_mmc_defconfig
index 4ae09ff..6cd1bfd 100644
--- a/configs/imx6ul_geam_mmc_defconfig
+++ b/configs/imx6ul_geam_mmc_defconfig
@@ -10,7 +10,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
 # CONFIG_CMD_BMODE is not set
-CONFIG_DEFAULT_DEVICE_TREE="imx6ul-geam-kit"
+CONFIG_DEFAULT_DEVICE_TREE="imx6ul-geam"
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
 CONFIG_FIT_VERBOSE=y