Make aarch64 work with --tag
rpm2cpio does not handle two rpms.
This leads to errors like:
= Writing sunxi-spl.bin for pine64_plus ....
dd: failed to open '/tmp/root//usr/share/uboot/pine64_plus/sunxi-spl.bin': No such file or directory
dd: failed to open '/tmp/root//usr/share/uboot/pine64_plus/u-boot.itb': No such file or directory
= Complete!
Prevent it by only feeding rpm2cpio one archive at a time.