beaglebone: bigger rootfs

...so that the system can at least boot properly, and still have some
free space.

Change-Id: If37179dc24b83a5ac3c4e54e61bf59ffa6a20f58
diff --git a/configs/czechlight_beaglebone_defconfig b/configs/czechlight_beaglebone_defconfig
index 47fb514..6b9ba38 100644
--- a/configs/czechlight_beaglebone_defconfig
+++ b/configs/czechlight_beaglebone_defconfig
@@ -22,6 +22,7 @@
 # BR2_PACKAGE_VIM_RUNTIME is not set
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_BLOCKS=131072
 BR2_TARGET_BAREBOX=y
 BR2_TARGET_BAREBOX_BOARD_DEFCONFIG="am335x"
 BR2_TARGET_BAREBOX_IMAGE_FILE="images/barebox-am33xx-beaglebone.img"