configs/qemu_xtensa_lx60_defconfig: switch to dc233c

dc232b is MMUv2 core, dc233c is very similar MMUv3 core. MMUv3 is the
latest full MMU for xtensa, which allows running both MMU and noMMU
linux variants.
Update configuration overlay and linux config file.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
4 files changed