Special sunxi-media-create for paydia SD cards

kernel modules are maitained at rootfs repo, and out of tree
built modules like unifi_sdio, gameio requires "depmod -a" to
regenerate the modules.dep and modules.dep.bin that exist and
maintained in rootfs repo.

copy again here will overwrite useful files of modules.dep and
its binary, so no copying rootfs here when creating SD card.
Remove the lib/modules part of the script

Last commit is just a copy, so that this copy will show what
is the difference, otherwise one new file commit doesn't
show what is the part that has been taken out.