gdb: add Piotr Rudnicki to gdb/MAINTAINERS

gdb/MAINTAINERS

diff --git a/gdb/MAINTAINERS b/gdb/MAINTAINERS
index 187a1f6..5e1aada 100644
--- a/gdb/MAINTAINERS
+++ b/gdb/MAINTAINERS
@@ -724,6 +724,7 @@
 Yvan Roux					yvan.roux@foss.st.com
 Ian Roxborough					irox@redhat.com
 Maciej W. Rozycki				macro@orcam.me.uk
+Piotr Rudnicki					piotr.rudnicki@intel.com
 Kamil Rytarowski				n54@gmx.com
 Grace Sainsbury					graces@redhat.com
 Kei Sakamoto					sakamoto.kei@renesas.com