stm32mp: syscon: manage clock when present in device tree

Enable the clocks during syscon probe when they are present in device tree.

This patch avoids a freeze when the SYSCFG clock is not enabled by
TF-A / OP-TEE.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
1 file changed