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
diff --git a/MAINTAINERS b/MAINTAINERS
index 71e2c74..5bb6a2f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -44,6 +44,6 @@
 
 M:  Benjamin Fair <benjaminfair@google.com> <benjaminfair!>
 M:  Brandon Kim <brandonkim@google.com> <brandonk!>
-M:  Fran Hsu <Fran.Hsu@quantatw.com> <franhsu!>
-M:  George Hung <George.Hung@quantatw.com> <ghung!>
-R:  Buddy Huang <Buddy.Huang@quantatw.com> <buddyhunag!>
+M:  Fran Hsu <fran.hsu@quantatw.com> <franhsu!>
+M:  George Hung <george.hung@quantatw.com> <ghung!>
+R:  Buddy Huang <buddy.huang@quantatw.com> <buddyhunag!>