Different versions of make behave differently in whether $(wildcard) sorts
the results or not. The Android build now explicitly sorts
all-named-subdir-makefiles which breaks the build because src/gallium
must be included after src/mesa/drivers/dri.

The Android build system doesn't support doing "include $(call
all-named-subdir-makefiles,...)" twice, so rework things by generating
the included makefile list and including them in 2 steps.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>