[FIX] Fix compiler error and warning in edrv-8111.c

Change-Id: I83791fd9c06558c6b8359c35ae1decbdbe395bc4
[TASK] Cleanup debug.h

Change-Id: I5aeb9b202a1f4afc70da29c528cce8002b716dc9
[TASK] Add revision information for 2.1.0

Change-Id: Iff44f1520237c5b11477afdbce199c7da0068e03
[TASK] Print error information to stderr in console demos

Change-Id: I61f31c7e3b2f3e118baeef2161eafe9a3f7614d8