MAINTAINERS: Add 'Performance Tools and Tests' subsection

This commit creates a new 'Miscellaneous' section which hosts a new
'Performance Tools and Tests' subsection. This subsection will contain
the the performance scripts and benchmarks written as a part of the
'TCG Continuous Benchmarking' project. Also, it will be a placeholder
for follow-ups to this project, if any.

Signed-off-by: Ahmed Karaman <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Reviewed-by: Aleksandar Markovic <[email protected]>
Signed-off-by: Aleksandar Markovic <[email protected]>
Message-Id: <[email protected]>

MAINTAINERS

@@ -1096,11 +1096,10 @@ F: hw/isa/vt82c686.c
 F: hw/pci-host/bonito.c
 F: include/hw/isa/vt82c686.h
 
-Loongson-3 Virtual Platform
+Loongson-3 virtual platforms
 M: Huacai Chen <[email protected]>
 R: Jiaxun Yang <[email protected]>
 S: Maintained
-F: hw/mips/loongson3_virt.c
 F: hw/intc/loongson_liointc.c
 
 Boston
@@ -3026,3 +3025,10 @@ M: Peter Maydell <[email protected]>
 S: Maintained
 F: docs/conf.py
 F: docs/*/conf.py
+
+Miscellaneous
+-------------
+Performance Tools and Tests
+M: Ahmed Karaman <[email protected]>
+S: Maintained
+F: scripts/performance/