espflash: Add two binary packages with NINA firmware.

- NINA_FW_v1.5.0_W102.bin for the u.blox W102 module or any other
  generic ESP32 device.
- NINA_FW_v1.5.0_Airlift.bin for Adafruit Airlift modules.

The two binaries only differ in which pin is used for the MOSI signals.
The u.blox module uses Pin 12, the Adafruit modules use Pin 14.
A generic ESP32 can be used with either firmware, given that MOSI
is connected accordingly.

Signed-off-by: robert-hh <[email protected]>

Author: robert-hh