MAINTAINERS: add myself as designated reviewer for generic string library

Add myself as designated reviewer for generic string library.

Link: https://lkml.kernel.org/r/20210504180819.73127-11-andriy.shevchenko@linux.intel.comSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -7648,6 +7648,14 @@ L:	linux-input@vger.kernel.org
 S:	Maintained
 F:	drivers/input/touchscreen/resistive-adc-touch.c
 
+GENERIC STRING LIBRARY
+R:	Andy Shevchenko <andy@kernel.org>
+S:	Maintained
+F:	lib/string.c
+F:	lib/string_helpers.c
+F:	lib/test_string.c
+F:	lib/test-string_helpers.c
+
 GENERIC UIO DRIVER FOR PCI DEVICES
 M:	"Michael S. Tsirkin" <mst@redhat.com>
 L:	kvm@vger.kernel.org