enable-psram: Make initialization more robust
enable-psram: Make initialization more robust

PSRAM was failing on some newer parts.  This change writes additional
values to the EMI controller early on that seems to fix the problems.

Signed-off-by: Sean Cross <dd28e116ed3e781f3ae781acae9fb18383f35c2f@kosagi.com>

mandl/fernly,urjaman/fernly,xobs/fernly,urjaman/fernly,xobs/fernly,mandl/fernly,mandl/fernly,pfalcon/fernly,pfalcon/fernly,urjaman/fernly