meta-agl-bsp: update mesa bbappend name

Upstream has renamed the mesa recipe to drop versioning, our bbappend
needs to be renamed to match.

Bug-AGL: SPEC-5147

Change-Id: I7458b867110fb743525aebc616fdc1156dc1644c
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

diff --git a/meta-agl-bsp/meta-core/recipes-graphics/mesa/mesa_%.bbappend b/meta-agl-bsp/meta-core/recipes-graphics/mesa/mesa.bbappend
similarity index 100%
rename from meta-agl-bsp/meta-core/recipes-graphics/mesa/mesa_%.bbappend
rename to meta-agl-bsp/meta-core/recipes-graphics/mesa/mesa.bbappend