bus/fslmc: fix to convert error msg to warning
bus/fslmc: fix to convert error msg to warning

This is just a information. No need to print
it as a error.

Fixes: ce9efbf5bb09 ("bus/fslmc: support dynamic logging")
Cc: stable@dpdk.org

Signed-off-by: Hemant Agrawal <90d96ef1ecd8ed49b97c7897be950e80824a9c5c@nxp.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk