modules: hal_ethos_u: ethosu_log depends on stdout console

ethosu_log.h uses the stdout as it's stream for printf. This could
cause an issue where if CONFIG_LOG=n and CONFIG_CONSOLE=y then there
would be no way to control the log level and it would default to debug
level. There is no NONE option as with the way the ethos-u hal is set
up with no way to go below the err level.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>