fatfs patch

[Savin Zlobec]

Fatfs code refactored, removed kernel dependencies, performance 
improvements
and most of the malloc usage removed - now it is used only at the fs 
init for private
fs data and block cache memory allocation (a CDL option could be used for
choosing dynamic or static versions in this case). The attached patch 
was not
extensively tested, so some testing and feedback is most welcome.

savin
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