MAINTAINERS: Add Kishon as maintainer of PHY bindings

DT bindings normally go in via subsystem maintainers, so add PHY
bindings under generic PHY framework.

Reported-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f485597..72e930c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6189,6 +6189,7 @@
 S:	Supported
 F:	drivers/phy/
 F:	include/linux/phy/
+F:	Documentation/devicetree/bindings/phy/
 
 GENERIC PINCTRL I2C DEMULTIPLEXER DRIVER
 M:	Wolfram Sang <wsa+renesas@sang-engineering.com>