MAINTAINERS: Adjust file list for PPC pseries machine

The fdt.{c.h} files provide a helper routine used by the pseries and
pnv machines. Attached it to the list of the larger one: pseries.

Protected Execution Facility (PEF) is the confidential guest support
for PPC pseries machines.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
1 file changed