travis: Change nrf pca10056 board to build with soft-device enabled.
travis: Change nrf pca10056 board to build with soft-device enabled.

To test building with SD which enables a lot of additional code.

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

adafruit/circuitpython,henriknelson/micropython,pramasoul/micropython,adafruit/circuitpython,selste/micropython,selste/micropython,bvernoux/micropython,bvernoux/micropython,henriknelson/micropython,selste/micropython,henriknelson/micropython,MrSurly/micropython,pramasoul/micropython,kerneltask/micropython,adafruit/circuitpython,pramasoul/micropython,henriknelson/micropython,selste/micropython,MrSurly/micropython,kerneltask/micropython,MrSurly/micropython,henriknelson/micropython,bvernoux/micropython,adafruit/circuitpython,selste/micropython,bvernoux/micropython,pramasoul/micropython,MrSurly/micropython,pramasoul/micropython,bvernoux/micropython,adafruit/circuitpython,kerneltask/micropython,adafruit/circuitpython,kerneltask/micropython,MrSurly/micropython,kerneltask/micropython