.mailmap: remove redundant mappings of emails

Remove two redundant mappings:
changbin.du@intel.com -> changbin.du@intel.com
viresh.kumar@linaro.org -> viresh.kumar@linaro.org

Link: https://lkml.kernel.org/r/20250129013430.1117720-1-carlos.bilbao@kernel.org


Signed-off-by: Carlos Bilbao <carlos.bilbao@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>