m53evk: Fix build failure due non-FSL kernel use with AMD GPU

The m53evk board uses the DENX kernel which is based in mainline and
does not has the need drivers for AMD GPU driver to build. This
patches makes it use the Framebuffer driver instead fixing a build
failure found in our autobuilder.

Change-Id: Iad1dfbb7f9ed342f374d9721228eff09e821377f
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Cc: Marek Vasut <marex@denx.de>
linux-denx: Fix branch name used for fetching

The branch, which contains the needed hash, is:

m53evk-rel-2013-05-02-v3.9

Fix the recipe accordingly.

Change-Id: Ie5d7b1f550d0d1ec92f3b4cea89f1b73d069cf32
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>