android: broadcom/cle: add gallium include path

Fixes the following building error:

In file included from external/mesa/src/broadcom/cle/v3d_decoder.c:38:
In file included from external/mesa/src/broadcom/cle/v3d_packet_helpers.h:29:
external/mesa/src/gallium/auxiliary/util/u_math.h:42:10:
fatal error: 'pipe/p_compiler.h' file not found
         ^~~~~~~~~~~~~~~~~~~
1 error generated.

Fixes: 5b102160 ("broadcom/genxml: Introduce a V3D packet/struct decoder.")
Cc: "18.2" <mesa-stable@lists.freedesktop.org>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
(cherry picked from commit 9158e0bd)