SD card XC test added
Added support for XC
Using SPI xSOFTip
SPI configuration for SD card support
module_spi_master included in the build
Removing sdcard_test.c. XC file added instead
Using SPI xSOFTip
Adding FAT FS API section
Adding SD card APIs
Doc changes
Revert "Using SPI xSOFTip"

This reverts commit 106fcdd9ee58c5ae5cd147662dec309a24fbe18e.
Review changes implemented
Review changes implemented
Added part number