Move the ST command in board/st/common, as this command is only used by ST board. Prepare the support in U-Boot of boards with STM32MP15x SOC but not STMicroelectronics.
Signed-off-by: Patrick Delaunay Reviewed-by: Patrice Chotard
ST BOARDS M: Patrick Delaunay <patrick.delaunay@st.com> L: uboot-stm32@st-md-mailman.stormreply.com (moderated for non-subscribers) T: git https://gitlab.denx.de/u-boot/custodians/u-boot-stm.git S: Maintained F: board/st/common/
