android: panfrost/encoder: add libmesa_nir static dependency

android: panfrost/encoder: add libmesa_nir static dependency

Fixes the following build error:

In file included from external/mesa/src/panfrost/encoder/pan_blit.c:34:
In file included from external/mesa/src/panfrost/encoder/../midgard/midgard_compile.h:27:
external/mesa/src/compiler/nir/nir.h:52:10: fatal error: 'nir_opcodes.h' file not found
         ^~~~~~~~~~~~~~~
1 error generated.

Fixes: 293f251871b ("panfrost: Use Midgard-specific reloads")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5961>