UBUNTU: SAUCE: Revert "net/tls(TLS_SW): Add selftest for 'chunked' sendfile test"

UBUNTU: SAUCE: Revert "net/tls(TLS_SW): Add selftest for 'chunked' sendfile test"

This reverts commit 0e6fbe39bdf71b4e665767bcbf53567a3e6d0623. Based
on the commit message, this commit was added to demonstrate a problem
with sendfile when using ktls, but there's no indication that this
problem has ever been fixed. I'm inquiring about this upstream [1],
but in the mean time let's remove this test as it looks like its
expected to fail.

[1] https://lore.kernel.org/netdev/YMumgy19CXCk5rZD@ubuntu-x1/

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>