Fix u-boot bbappend for vayu board

Change-Id: Ic6d76c389b6eadb2d31f91593a927baefb1cd819
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>

diff --git a/meta-agl-bsp/meta-ti/recipes-bsp/u-boot/u-boot-ti-staging_2015.07.bbappend b/meta-agl-bsp/meta-ti/recipes-bsp/u-boot/u-boot-ti-staging_%.bbappend
similarity index 100%
rename from meta-agl-bsp/meta-ti/recipes-bsp/u-boot/u-boot-ti-staging_2015.07.bbappend
rename to meta-agl-bsp/meta-ti/recipes-bsp/u-boot/u-boot-ti-staging_%.bbappend