configs/nanopi_neo: determine roofs partition size automatically

Let genimage determine rootfs partition size based on the filesystem
image size.

Signed-off-by: Viktar Palstsiuk <viktar.palstsiuk@promwad.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/friendlyarm/nanopi-neo/genimage.cfg

@@ -29,6 +29,5 @@ image sdcard.img {
 	partition rootfs {
 		partition-type = 0x83
 		image = "rootfs.ext4"
-		size = 32M
 	}
 }

configs/nanopi_neo_defconfig

@@ -31,8 +31,6 @@ BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot-sunxi-with-spl.bin"
 # Build an sdcard image
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
-BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
-BR2_TARGET_ROOTFS_EXT2_INODES=8192
 # BR2_TARGET_ROOTFS_TAR is not set
 BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y