mailmap: update entry for Ethan Carter Edwards

Map old gmail + name to my current full name and email.

Link: https://lkml.kernel.org/r/xbfkmvmp4wyxrvlan57bjnul5icrwfyt67vnhhw2cyr5rzbnee@mfvihhd6s7l5


Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>