sf: Cleanup spi_flash_info{}

sf: Cleanup spi_flash_info{}

- Proper tabs spaces
- Removed unnecessary
- Add comments in spi_flash_info members
- Add comments for spi_flash_info.flags

Cc: Simon Glass <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: York Sun <[email protected]>
Cc: Vignesh R <[email protected]>
Cc: Mugunthan V N <[email protected]>
Cc: Michal Simek <[email protected]>
Signed-off-by: Jagan Teki <[email protected]>
Reviewed-by: Siva Durga Prasad Paladugu <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>