tune-cortexa72: Fix a misspelt override in PACKAGE_EXTRA_ARCHS
Without this, the string "${PACKAGE_EXTRA_ARCHS:tune-armv8-crc}" will
show up in some bash tasks (notably opkg-arch-config.do_compile which is
how I found out about this) which will break things (besides obviously
not doing the intended thing of expanding to a list of architectures)
Signed-off-by: Luna Gräfje <luna.graefje@orbitalsystems.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
