boards/stm32: revert forced use of dma feature in STM32 boards

testrunner: fix script when RIOTBASE is not defined

The periph_dma is not pulled in automatically for all applications.
Applications willing to use the configured peripherals with periph_dma
for a given board will have to include the feature explictly in their
Makefile.

It was causing unrelated issues as threads got de-scheduled while
calling printf and this was not handled properly in tests at that
moment.

If not defined it was raising a KeyError. Use the 'get' function to
handle non defined value.

It did not put the value in the `default` case as it would have changed
the behavior when `RIOTBASE` is defined but empty.

boards/b-l475e-iot01a: provide already configured RTC and RTT features

RTC and RTT are available and already configured for this board but not provided by the build system

cpu/esp32: fixes the memset optimization problem in esp_wifi/wpa_supplicant

nrfmin: fix type for NETOPT_PROTO

Makefile.include: append the values to GLOBAL_GOALS

The type [is documented as `gnrc_nettype_t`][1] so it should by checked
as such.

[1]: https://github.com/RIOT-OS/RIOT/blob/f9a3bdf1a749f0e6a0d9e79eee652d8b31d4d9e0/sys/include/net/netopt.h#L210-L212

net/nanocoap: fix confirmable retry countdown

eui48: fix type alignment

This allows setting other GLOBAL_GOALS by setting it before.
This could be the case for the application `Makefile` or files parsed
from `RIOT_MAKEFILES_GLOBAL_PRE`.

tests/pkg_{hacl,monocypher}: set custom timeout value

tests/periph_rtc: add automatic python test script

tests/periph_flashpage: improve flashpage tests

On samr30-xpro the tests takes respectively 20 and 14 seconds to complete

examples/gcoap: verify buffer size

tests/periph_rtc: fix alarm period in README

The default period value the application code is set to 2s

doc: fix warnings in *_params.h

nrfmin: remove long address support

pkg/nordic_softdevice_ble: Use MAC48 as hardware address

This is just a compatibility issue waiting to happen as soon as there
is support for a more standard-compliant implementation of BLE (like
e.g. NimBLE ;-)).

boards/hifive1: fix file permissions of flasher.sh

cpu/esp32: esp_wifi netdev driver

ESP-IDF heap handling has to be used for esp_wifi for stability reasons. Otherwise, heap is corrupted sporadically

Fixes sporadic blocking of the wifi thread in esp_wifi_recv_cb function under heavy network load conditions when frames are coming in faster than they can be processed. Since esp_wifi_recv_cb function is not executed in interrupt context, the msg_send function used for ISR event can block when the message queue is full. With this change esp_wifi can be flooded with icmpv6 packets of maximum size without any problems over hours.

To avoid further inconsistencies in documentation, README.md is not provided any longer