MAINTAINERS: Add entry for Broadcom STB I2C controller

Add an entry for the Broadcom STB I2C controller in the MAINTAINERS file.

Signed-off-by: Kamal Dasu <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
[wsa: fixed sorting and a whitespace error]
Signed-off-by: Wolfram Sang <[e-mail]>

MAINTAINERS

···
 F:	drivers/gpio/gpio-brcmstb.c
 F:	Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
 
+BROADCOM BRCMSTB I2C DRIVER
+M:	Kamal Dasu <[e-mail]>
+L:	[e-mail]
+L:	[e-mail]
+S:	Supported
+F:	drivers/i2c/busses/i2c-brcmstb.c
+F:	Documentation/devicetree/bindings/i2c/i2c-brcmstb.txt
+
 BROADCOM BRCMSTB USB2 and USB3 PHY DRIVER
 M:	Al Cooper <[e-mail]>
 L:	[e-mail]