Fedora AArch64 (64-bit ARM) support in diskimage-builder

Add some checks for AArch64 to avoid the "Unknown architecture" or
"architecture not supported" messages, and allow builds to complete.

Change-Id: I89ba609abaeeb7019eb317cf13473929b2065230

elements/architecture-emulation-binaries/extra-data.d/01-copy-binary

@@ -53,7 +53,7 @@ case "$ARCH" in
         qemu_binary_file="/usr/bin/qemu-arm-static"
         copy_binary $qemu_binary_file $ARCH
     ;;
-    "arm64")
+    "arm64" | "aarch64")
         qemu_binary_file="/usr/bin/qemu-aarch64-static"
         copy_binary $qemu_binary_file $ARCH
     ;;

elements/rpm-distro/pre-install.d/01-override-yum-arch

@@ -18,6 +18,9 @@ elif [[ "$ARCH" = "ppc64" ]]; then
 elif [[ "$ARCH" = "ppc64el" ]]; then
     basearch=ppc64el
     arch=ppc64el
+elif [[ "$ARCH" = "aarch64" ]]; then
+    basearch=aarch64
+    arch=aarch64
 else
     echo "********************"
     echo "Unknown arch '$ARCH'"

lib/common-defaults

@@ -26,6 +26,8 @@ else
     "armv"*)
       _ARCH="armhf"
       ;;
+    "aarch64")
+      ;;
     *)
       echo "WARNING: Unknown architecture: $_ARCH"
       ;;