MAINTAINERS: add git URL for at24

Add the link to my git tree to the at24 section.
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

MAINTAINERS

@@ -2262,6 +2262,7 @@ F:	include/linux/async_tx.h
 AT24 EEPROM DRIVER
 M:	Bartosz Golaszewski <brgl@bgdev.pl>
 L:	linux-i2c@vger.kernel.org
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
 S:	Maintained
 F:	Documentation/devicetree/bindings/eeprom/at24.txt
 F:	drivers/misc/eeprom/at24.c