[patch] Drop reclass.system patch for repo arch

[patch] Drop reclass.system patch for repo arch

MCP repos no longer publish arm64 metadata, so drop our patch that
selected arm64 metadata on arm64 systems.
Instead, let it default to 'deb [arch=amd64]', which will allow
arm64 systems to fetch amd64 metadata and inherintely fetch all
arch-independent packages from the same repos.

While at it, switch to 'rocky-armband' repos on arm64 systems.

Change-Id: I07fda895f5162bfa576c62336cbb4d74e985f37a
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>