ARM: dts: dra7xx: Add u-boot specific property for PCF8575 nodes

PCF8575 does not have any registers hence, offset field needs to be
ignored for i2c read/write. Therefore populate u-boot,i2c-offset-len
with 0 in PCF8575 DT nodes.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/dts/dra7-evm.dts

@@ -415,6 +415,7 @@
 		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
 		interrupt-controller;
 		#interrupt-cells = <2>;
+		u-boot,i2c-offset-len = <0>;
 	};
 
 };

arch/arm/dts/dra72-evm.dts

@@ -348,6 +348,7 @@
 		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
 		interrupt-controller;
 		#interrupt-cells = <2>;
+		u-boot,i2c-offset-len = <0>;
 	};
 };
 
@@ -369,6 +370,7 @@
 		 * VIN6_SEL_S0 is low, thus selecting McASP3 over VIN6
 		 */
 		lines-initial-states = <0x0f2b>;
+		u-boot,i2c-offset-len = <0>;
 	};
 };