db845c: Add tweaks to properly support emulated storage w/o sdcardfs

Now that sdcardfs is deprecated, we need a few tweaks to
support emulated storage on the board.

Thanks so much to Martijn Coenen and Daniel Rosenberg for
their help narrowing down the changes needed here.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I66aa4010df196e9fa7ca6a0be612f706e83a2715
2 files changed