Revert "i9500: fix storage (internal and external) problems"

This reverts commit c667d37736bb644b72227e9a867f4e7285500199.
Revert "i9500: set persist.fuse_sdcard=true"

This reverts commit fb7407224390a45503797e71dd7115279c473a75.
Revert "BoardConfig: enable QCOM libm Optimizations"

This reverts commit 6677bcc65b0ad1146084d19e9cb44bbcb422cf4b.