u-boot-fslc: Upgrade to 2018.11-based fork
This upgrade our fork to the current stable release. It got most of
our patches merged and now it has a very small set which are basically
Yocto Project specific stuff.
Still applied patches are:
1f39b911b7 mx25pdk: Change root to use a single partition layout
a0f8bec9d3 mx6sabre_common: Dynamically change the video output
7847536319 mx6sabresd: Enable video interfaces in bootargs
994d8e0733 mx6sabresd: Use LDO dtb file until LDO bypass support is added
c6c87fb39b mx6slevk: Use LDO dtb file until LDO bypass support is added
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>