android: broadcom/cle: export the broadcom top level path headers

Fixes the following building error in vc4 build:

In file included from external/mesa/src/gallium/drivers/vc4/kernel/vc4_render_cl.c:34:
In file included from external/mesa/src/gallium/drivers/vc4/kernel/vc4_drv.h:27:
In file included from external/mesa/src/gallium/drivers/vc4/vc4_simulator_validate.h:34:
In file included from external/mesa/src/gallium/drivers/vc4/vc4_context.h:39:
In file included from external/mesa/src/gallium/drivers/vc4/vc4_cl.h:56:
gen/STATIC_LIBRARIES/libmesa_broadcom_genxml_intermediates/broadcom/cle/v3d_packet_v21_pack.h:12:10:
fatal error: 'cle/v3d_packet_helpers.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 cc3b99bb)