linux-olinuxino: FAT32 support fix and SPI fixes/updates.

This pull request contains two changes.

The first one is required to mount FAT32 volumes. Without this additional module I always get an error message "FAT: codepage cp437 not found".

The second commit adds one more SPI bugfix which is already included in newer kernels and a small change to enable the /dev/spidev usermode access to get control over the SPI port. This support is required when porting over software that was initially written for the Raspberry Pi, which has an /dev/spidev interface by default.