verdin-imx8mm: automatic ram size detection

Implement board_phys_sdram_size() to automatically detect Verdin iMX8M
Mini DualLite 1GB vs. Verdin iMX8M Mini Quad 2GB.

Note: This only works if we keep using similar RAM chips!

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
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