android: i965: add per-gen libmesa_i965_gen{4,45,5} static

android: i965: add per-gen libmesa_i965_gen{4,45,5} static

Needed to fix android building errors:

external/mesa/src/mesa/drivers/dri/i965/brw_state_upload.c:148: error: undefined reference to 'gen5_init_atoms'
external/mesa/src/mesa/drivers/dri/i965/brw_state_upload.c:150: error: undefined reference to 'gen45_init_atoms'
external/mesa/src/mesa/drivers/dri/i965/brw_state_upload.c:152: error: undefined reference to 'gen4_init_atoms'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

Fixes: 5a19d0b ("i965: Get real per-gen atom lists")
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>