MAINTAINERS: add myself as smbx charger driver maintainer

Missed when this originally went upstream, add myself to the MAINTAINERS
file for this driver.

Signed-off-by: Casey Connolly <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/mtd/qcom,nandc.yaml
 F:	drivers/mtd/nand/raw/qcom_nandc.c
 
+QUALCOMM SMB CHARGER DRIVER
+M:	Casey Connolly <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	Documentation/devicetree/bindings/power/supply/qcom,pmi8998-charger.yaml
+F:	drivers/power/supply/qcom_smbx_charger.c
+
 QUALCOMM QSEECOM DRIVER
 M:	Maximilian Luz <[e-mail]>
 L:	[e-mail]