This reverts commit 03062ea3.

The patch is wrong, because it duplicates

    9491e61b

 ppsi: pick new master and fix building accordingly

which does the "fixing" in a more elegant way. With both in history,
we now have

   ./ppsi/include/generated/autoconf.h:13:0: warning:
           "CONFIG_VLAN_ARRAY_SIZE" redefined
   generated/autoconf.h:14:0: note: this is the previous definition

Besides, the reverted commit was not even using new ppsi master (we
did it before this commit).

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>