fat: replace LINEAR_PREFETCH_SIZE with PREFETCH_BLOCKS
Currently in do_fat_read() when reading FAT sectors, we have to divide down
LINEAR_PREFETCH_SIZE by the sector size, whereas it's defined as 2 sectors
worth of bytes. In order to avoid redundant multiplication/division, introduce
#define PREFETCH_BLOCKS instead of #define LINEAR_PREFETCH_SIZE.
Signed-off-by: NSergei Shtylyov <sshtylyov@mvista.com>
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