meta-blackfinn: Add support for raspberrypi4-64

Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>

recipes-devtools/opkg/files/raspberrypi4_64/opkg.conf

@@ -0,0 +1,32 @@
+# Must have one or more source entries of the form:
+#
+#   src <src-name> <source-url>
+#
+# and one or more destination entries of the form:
+#
+#   dest <dest-name> <target-path>
+#
+# where <src-name> and <dest-names> are identifiers that
+# should match [a-zA-Z0-9._-]+, <source-url> should be a
+# URL that points to a directory containing a Familiar
+# Packages file, and <target-path> should be a directory
+# that exists on the target system.
+
+# Proxy Support
+#option http_proxy http://proxy.tld:3128
+#option ftp_proxy http://proxy.tld:3128
+#option proxy_username <username>
+#option proxy_password <password>
+
+# Enable GPGME signature
+# option check_signature 1
+
+# Offline mode (for use in constructing flash images offline)
+#option offline_root target
+
+src/gz all https://opkg.blackfinn.de/thud/all
+src/gz raspberrypi4_64 https://opkg.blackfinn.de/thud/raspberrypi4_64
+src/gz aarch64 https://opkg.blackfinn.de/thud/aarch64
+
+# Default destination for installed packages
+dest root /