bootloaders: Use https:// for fetching instead of ssh://

All the projects we work on are public.
There is no reason to require ssh authentication when fetching the projects.

Move to https:// for the baylibre remote.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

bootloaders.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <manifest>
-    <remote name="baylibre" fetch="ssh://git@gitlab.baylibre.com/baylibre/ti" />
+    <remote name="baylibre" fetch="https://gitlab.baylibre.com/baylibre/ti/" />
     <remote name="ti" fetch="git://git.ti.com/" />
     <remote name="github" fetch="https://github.com/" />
     <remote name="tf-a" fetch="git://git.trustedfirmware.org/" />