Remove remaining ifdefs from CESA header

Commit r312743 ("Use SoC ID - based detection in CESA") resulted
in build failing for Marvell armv5 platforms, which don't support
the newer version of CESA controller. This patch provides a fix by
removing ifdefs around bitfields' definitions, so that they are
known to all platforms.

Submitted by: Marcin Wojtas <mw@semihalf.com>
Obtained from: Semihalf
Sponsored by: Stormshield