MAINTAINERS: add myself as sl28vpd nvmem layout driver

Add myself as a maintainer for the new sl28vpd nvmem layout driver.
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230404172148.82422-23-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -19175,6 +19175,12 @@ F:	drivers/irqchip/irq-sl28cpld.c
 F:	drivers/pwm/pwm-sl28cpld.c
 F:	drivers/watchdog/sl28cpld_wdt.c
 
+SL28 VPD NVMEM LAYOUT DRIVER
+M:	Michael Walle <michael@walle.cc>
+S:	Maintained
+F:	Documentation/devicetree/bindings/nvmem/layouts/kontron,sl28-vpd.yaml
+F:	drivers/nvmem/layouts/sl28vpd.c
+
 SLAB ALLOCATOR
 M:	Christoph Lameter <cl@linux.com>
 M:	Pekka Enberg <penberg@kernel.org>