[platform/questone2bd] Support CPU and RAM voltag monitor via ADC (sonic-net#197)

* [platform/questone2bd] FPGA_I2C_MASTER_6 now use i2c driver.

 * To support max11617 driver, which requires the adapter to support plain I2C functionality.

* [platform/questone2bd] Init max11617 IIO device when system start.

Author: pphuchar

platform/broadcom/sonic-platform-modules-cel/debian/platform-modules-questone2bd.init

@@ -20,6 +20,7 @@ start)
         modprobe pmbus_core
         modprobe i2c-imc allow_unsafe_access=1
         modprobe baseboard_cpld
+        modprobe i2c-ocores-polling
         modprobe switchboard_fpga allow_unsafe_i2c_access=1
         modprobe mc24lc64t
         modprobe i2c_dev_sysfs
@@ -51,6 +52,9 @@ start)
         echo lm75b 0x48 > /sys/bus/i2c/devices/i2c-9/new_device
         echo lm75b 0x4d > /sys/bus/i2c/devices/i2c-67/new_device
 
+        # Populate voltage sensors reading
+        echo max11617 0x35 > /sys/bus/i2c/devices/i2c-71/new_device
+
         # Populate EEPROM
         ## FAN
         echo 24lc64t 0x50 > /sys/bus/i2c/devices/i2c-2/new_device

platform/broadcom/sonic-platform-modules-cel/questone2bd/modules/Makefile

@@ -1,2 +1,2 @@
-obj-m := mc24lc64t.o baseboard_cpld.o switchboard_fpga.o i2c-imc.o
+obj-m := mc24lc64t.o baseboard_cpld.o switchboard_fpga.o i2c-imc.o i2c-ocores-polling.o
 obj-m += i2c_dev_sysfs.o syscpld.o fancpld.o dps1100.o