Add support for more FAT partitions; support for SD cards greater than 4Gb;...

Add support for more FAT partitions; support for SD cards greater than 4Gb; TSC2007 touchscreen driver improvements

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4092 42af7a65-404d-4744-a932-0658087f49c3