Rework of sdcard storage for NXP MIMXRT1060 port#1530

Merged

josesimoes merged 5 commits intonanoframework:developfrom morali:develop-evk/sdcard

Dec 18, 2019

+528-516

Commits on Dec 18, 2019

Move fopen to working thread (increase SDcard operations speed)
Jeremi Jasiński
committed
Fix exiting wokring thread without killing task (sdcard)
Jeremi Jasiński
committed
Fix two conditional ifs to set proper error flags
Jeremi Jasiński
committed
Revert incorrect use of malloc
Jeremi Jasiński
committed
Replace free with platform_free
Jeremi Jasiński
committed