layerscape/armv8_64b: CONFIG_DEBUG_INFO_REDUCED

[Stijn Tintel]

Hi Yangbo,

In https://git.openwrt.org/8fdda1cc you introduced
CONFIG_DEBUG_INFO_REDUCED as disabled for layerscape/armv8_64b. Do you
remember if this was intentional? The generic kernel configs have this
enabled, and layerscape/armv8_64b is the only subtarget that overrides
it. If this wasn't intentional, I'd like to remove the symbol from the
layerscape/armv8_64b configs so all targets are consistent, before
introducing a new kernel config option for it.

Thanks,
Stijn