[committed] MAINTAINERS: Add myself to write after approval

[Richard Ball via Gcc-patches]

Sponsored by Richard Sandiford <richard.sandif...@arm.com>
ChangeLog:

        * MAINTAINERS: Add myself.

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diff --git a/MAINTAINERS b/MAINTAINERS
index 49aa6bae73b..a8bb43f50c3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -332,6 +332,7 @@ David Ayers 
<ay...@fsfe.org>
 Prakhar Bahuguna                               <prakhar.bahug...@arm.com>
 Giovanni Bajo                                  <giovannib...@gcc.gnu.org>
 Simon Baldwin                                  <sim...@google.com>
+Richard Ball                                   <richard.b...@arm.com>
 Scott Bambrough 
<sco...@netwinder.org>
 Wolfgang Bangerth                              <bange...@dealii.org>
 Gergö Barany                                   <ge...@codesourcery.com>