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Fixes the regression introduced in ea3c80a5

Via: nic.config(trace=2|4)

With dual-core enabled it's possible that the uPy task has full utilisation
of CPU1.  Fixes issue #4673.

When running Linux on WSL, Popen.kill() can raise a ProcessLookupError if
the process does not exist anymore, which can happen here since the
previous statement already tries to close the process by sending Ctrl-D to
the running repl.  This doesn't seem to be a problem on other OSes, so just
swallow the exception silently since it indicates the process has been
closed already, which after all is what we want.

Since commit da938a83 the tcp_arg() that is
set for the new connection is the new connection itself, and the parent
listening socket is found in the pcb->connected entry.

See corresponding commit b5f33ac2

Enable it via MICROPY_HW_ENABLE_MMCARD.

For consistency with the majority of other MICROPY_HW_ENABLE_xxx macros.

Fixes issue #3375.

This is needed now that the accept queue can have pending connections
removed asynchronously.

In such a case the connection is aborted by lwIP and so must be removed
from the pending accept queue.

The break mode is configurable via the 'brk' keyword to the Timer
constructor and init method.  It's disabled by default.

Use uos.dupterm for REPL configuration of the main USB_VCP(0) stream on
dupterm slot 1, if USB is enabled.  This means dupterm can also be used to
disable the boot REPL port if desired, via uos.dupterm(None, 1).

For efficiency this adds a simple hook to the global uos.dupterm code to
work with streams that are known to be native streams.

Single core is still supported, just by adding CONFIG_FREERTOS_UNICORE=y to
a custom sdkconfig file.

Unnamed semaphores (via sem_init) are not supported on this OS.  See #4465.

These macros are unused, and they can conflict with other entities by the
same name.  If needed they can be provided as static inline functions, or
just functions.

Fixes issue #4559.

This allows formatting SD cards, larger flash etc which do not support the
default FAT16/SFD format mode.

If HSI is used the calibration value must be valid.  Fixes #4596.

This means the schedule operates on a first-in, first-executed manner
rather than the current last-in, first executed.

Adds support for hardware i2c to the zephyr port. Similar to other ports
such as stm32 and nrf, we only implement the i2c protocol functions
(readfrom and writeto) and defer memory operations (readfrom_mem,
readfrom_mem_into, and writeto_mem) to the software i2c implementation.
This may need to change in the future because zephyr is considering
deprecating its i2c_transfer function in favor of i2c_write_read; in this
case we would probably want to implement the memory operations directly
using i2c_write_read.

Tested with the accelerometer on frdm_k64f and bbc_microbit boards.

For gpio_hold_en() to work properly (not draw additional current) pull
up/down must be disabled when hold is enabled.  This patch makes sure this
is the case by reworking the pull constants to be a bit mask.