Enable Bootloader LEDs on W1850

This commit enables the LED controller on the W1850.  The new version is
D.WAYNE v4.1.0, and also makes the factory reset pattern match the L950.

Finally, the default configuration is updated to respect the "silent"
environment variable.

Change-Id: I65d71d80dc441959294282e18b5c285ae65a0a22
3 files changed