ARM: imx: Factor common code out of Data Modul i.MX8M Mini eDM SBC

Pull common.c into common subdirectory of the board file,
since this code can be reused by other Data Modul SBCs.
Drop the include of lpddr4_timing.h, which is unneeded.

Signed-off-by: Marek Vasut <marex@denx.de>
7 files changed