zephyr/mpconfigport: Use MICROPY_CONFIG_ROM_LEVEL_BASIC_FEATURES.

This commit adjusts the configuration of the standard zephyr build to use
MICROPY_CONFIG_ROM_LEVEL_BASIC_FEATURES.  That's a lot cleaner than
explicitly enabling/disabling options, and allows boards to more easily
fine-tune the settings, eg select a different feature level.

Features that are now enabled are:
- async/await keyword support
- `filter`, `property` and `reversed` builtins
- `range` attributes
- `str.count()` method
- `array` module with `array.array` object
- `collections` module with `collections.namedtuple` object
- `struct` module with everything
- `id = const()` and constant folding in the compiler

Bulding qemu_cortex_m3, the code size was originally:

    Memory region         Used Size  Region Size  %age Used
               FLASH:      193864 B       256 KB     73.95%
                 RAM:       61992 B        64 KB     94.59%

and with this commit it is now:

    Memory region         Used Size  Region Size  %age Used
               FLASH:      200698 B       256 KB     76.56%
                 RAM:       61992 B        64 KB     94.59%

That's a mild increase of +6834 bytes flash usage for a good selection of
new features.

Signed-off-by: Damien George <damien@micropython.org>

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