unix/mpconfigport_coverage.h: Enable MICROPY_PY_IO_RESOURCE_STREAM.

Where possible it's important to test all code in the code base.

ports/unix/mpconfigport_coverage.h

@@ -41,6 +41,7 @@
 #define MICROPY_PY_SYS_GETSIZEOF       (1)
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS (1)
 #define MICROPY_PY_IO_BUFFEREDWRITER (1)
+#define MICROPY_PY_IO_RESOURCE_STREAM (1)
 #undef MICROPY_VFS_FAT
 #define MICROPY_VFS_FAT                (1)
 #define MICROPY_PY_FRAMEBUF            (1)