Fix spelling mistakes using codespell

This commit corrects various spelling mistakes throughout the
repository. The corrections were made automatically using `codespell`[1]
tool.

[1]: https://github.com/codespell-project/codespell



Change-Id: I16082f7e664541e98fa1cae2b2bcce59dd9cb250
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>