u-boot-fslc: Update to 2015.01-rc3 based version

This uses revision 5d396c3 which includes the 2015.01-rc3 development
version with following changes on top of it:

5d396c3 wandboard: Changed mmcroot variable so kernel 3.10.31 boots
c6d9bf7 iMX6: Change mmcroot to use fixed mmc block index for USDHC
be9a741 embestmx6boards: Change default bootenv configuration
ea9b369 wandboard: Use 32bit color depth for Fusion LCD
8e88da8 mx6sabresd: Use LDO dtb file until LDO bypass support is added
7d0f155 mx6slevk: Use LDO dtb file until LDO bypass support is added
dcd7ac3 mx6sabresd: Use mmcblk0 for CONFIG_MMCROOT

The repository URL has also been changed to point to the new Git
repository name (u-boot-fslc), however the previous repository is
still accessible to avoid breakage in old versions of meta-fsl-arm.

Change-Id: I4be932c8621508dba4171bfab28aa4e2799aaece
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>