u-boot-ti-staging: add version 2015.07-rc3
u-boot-ti-staging: add version 2015.07-rc3

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

RedFIR/meta-ti,joelagnel/meta-ti,RedFIR/meta-ti,RedFIR/meta-ti,rcn-ee/meta-ti,rcn-ee/meta-ti,RedFIR/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,joelagnel/meta-ti