[arista] update Arista drivers submodules (#4967)

Merge most of the changes that recently made it to master.
This will be the last such merge operation and future commits will only cherry-pick fixes and targeted features.

Major fixes and features,
- reboot cause enhancement with more hardware reboot cause reporting
- fix reboot cause parsing issue with 201811 release
- fix get_change_event logic
- fix error message on missing sysfs entry by our plugins
- final piece of the platform refactors for fan and sensor reporting through the platform API

Author: Staphylo

device/arista/x86_64-arista_7280cr3_32p4/fancontrol

@@ -1,7 +1,7 @@
 INTERVAL=5
-DEVPATH=hwmon2=devices/pci0000:00/0000:00:09.0 hwmon4=devices/pci0000:00/0000:00:09.0/i2c-56/56-004c
-DEVNAME=hwmon2=scd_fan_p3 hwmon4=max6658
-FCTEMPS=hwmon2/pwm6=hwmon4/temp1_input hwmon2/pwm5=hwmon4/temp1_input hwmon2/pwm4=hwmon4/temp1_input hwmon2/pwm4=hwmon4/temp1_input hwmon2/pwm2=hwmon4/temp1_input hwmon2/pwm1=hwmon4/temp1_input
+DEVPATH=hwmon2=devices/pci0000:00/0000:00:09.0 hwmon3=devices/pci0000:00/0000:00:09.0/i2c-56/56-004c
+DEVNAME=hwmon2=scd_fan_p3 hwmon3=max6658
+FCTEMPS=hwmon2/pwm6=hwmon3/temp1_input hwmon2/pwm5=hwmon3/temp1_input hwmon2/pwm4=hwmon3/temp1_input hwmon2/pwm3=hwmon3/temp1_input hwmon2/pwm2=hwmon3/temp1_input hwmon2/pwm1=hwmon3/temp1_input
 FCFANS=hwmon2/pwm6=hwmon2/fan6_input hwmon2/pwm5=hwmon2/fan5_input hwmon2/pwm4=hwmon2/fan4_input hwmon2/pwm3=hwmon2/fan3_input hwmon2/pwm2=hwmon2/fan2_input hwmon2/pwm1=hwmon2/fan1_input
 MINTEMP=hwmon2/pwm6=50 hwmon2/pwm5=50 hwmon2/pwm4=50 hwmon2/pwm3=50 hwmon2/pwm2=50 hwmon2/pwm1=50
 MINPWM=hwmon2/pwm6=128 hwmon2/pwm5=128 hwmon2/pwm4=128 hwmon2/pwm3=128 hwmon2/pwm2=128 hwmon2/pwm1=128