script: drop calculate_rootfs_partition

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: drop fatfs_img_file

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: drop fatfs_boot (fdisk)

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: drop fatfs_boot_error

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: with sfdisk, no reason to create msdos label

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: parted is no longer required

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
script: since we no longer use fdisk to create the partition table, we do not need the check for an use the non-gnu version of fdisk...

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>