fastboot: support f2fs format

+ quota support

This patch fixes broken f2fs_format by replacing the existing flow with calling
legacy mkfs.f2fs binary explicitly likewise ext4.

This removes obsolete ext4 stuffs as well.

Bug: 67009570
Change-Id: Ia81bcbc7adc3a8b57ada860f7f7871602ac1c6e9
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>