ARM: dts: zc702: Fix I2C bus warnings

ARM: dts: zc702: Fix I2C bus warnings

The dtc has new checks for I2C and SPI buses.
Fix the warnings in node names and unit-addresses.

Warning from Linux kernel:
arch/arm/boot/dts/zynq-zc702.dts:187.13-190.6: Warning (i2c_bus_reg): /amba/i2c@e0004000/i2c-mux@74/i2c@7/hwmon@52: I2C bus unit address format error, expected "34"
arch/arm/boot/dts/zynq-zc702.dts:191.13-194.6: Warning (i2c_bus_reg): /amba/i2c@e0004000/i2c-mux@74/i2c@7/hwmon@53: I2C bus unit address format error, expected "35"
arch/arm/boot/dts/zynq-zc702.dts:195.13-198.6: Warning (i2c_bus_reg): /amba/i2c@e0004000/i2c-mux@74/i2c@7/hwmon@54: I2C bus unit address format error, expected "36"

Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>