checkpatch: increate line length to 100

Change max line length to 100, this is to follow Linux and to allow for
more readable code. Most warning we get now from checkpatch are because
of this limit which has prevented us from enforcing warning.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

.checkpatch.conf

@@ -1,7 +1,7 @@
 --emacs
 --summary-file
 --show-types
---max-line-length=80
+--max-line-length=100
 --min-conf-desc-length=1
 --typedefsfile=scripts/checkpatch/typedefsfile