u-boot-ti-staging: update to ti2018.03-rc2 tag
u-boot-ti-staging: update to ti2018.03-rc2 tag

Signed-off-by: Dan Murphy <50b72235ef2106735bf2282950a69d11e6d56bc7@ti.com>
Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti