MAINTAINERS: update email addresses to match Gerrit

3 of the email addresses listed in the MAINTAINERS file do not
match their registered email addresses with Gerrit.  Update to
match by changing the cases (all lower-case).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I1c8f9122391256379efbd3881af5c85d43dff3a4
1 file changed