remoproc: stm32: migrate trace to log macro
Define LOG_CATEGORY and remove unneeded pr_fmt macro with the dev
macro as dev->name is displayed and CONFIG_LOGF_FUNC can be
activated for log macro.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>