MAINTAINERS: Update FREESCALE SOC DRIVERS and QUICC ENGINE LIBRARY

FREESCALE SOC DRIVERS has been orphaned since
commit eaac25d0 ("MAINTAINERS: Drop Li Yang as their email address
stopped working")
QUICC ENGINE LIBRARY has Qiang Zhao as maintainer but he hasn't
responded for years and when Li Yang was still maintaining FREESCALE
SOC DRIVERS he was also handling QUICC ENGINE LIBRARY directly.

As a maintainer of LINUX FOR POWERPC EMBEDDED PPC8XX AND PPC83XX, I
also need FREESCALE SOC DRIVERS to be actively maintained, so add
myself as maintainer of FREESCALE SOC DRIVERS and QUICC ENGINE LIBRARY.

See below link for more context.

Link: https://lore.kernel.org/linuxppc-dev/20240219153016.ntltc76bphwrv6hn@skbuf/T/#mf6d4a5eef79e8eae7ae0456a2794c01e630a6756


Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>