Update git submodules

* Update src/sonic-platform-common from branch 'broadcom_sonic'
  to 01aa61046ae3ab0a062d917a9daad3b872fe26c7
  - Merge 201904 branch to broadcom_sonic branch on Mon Jul  1 13:57:55 PDT 2019
    
    Change-Id: I5780d95dc673da7fc9083e370062dea8a9d720c0
    
  - Added type abbrev name to be used in media_settings.json for Dynamic transceiver tuning  (#32)
    
    
    
  - [sonic_platform_base] Add sonic_sfp and sonic_eeprom to sonic_platform_base (#27)
    
    * add sonic_sfp and sonic_eeprom to sonic_platform_base
    
    * make original sonic_sfp and sonic_eeprom as symbol link to the new subfolder under sonic_platform_base to avoid duplicate files
    
    * Revert "make original sonic_sfp and sonic_eeprom as symbol link to the new subfolder under sonic_platform_base to avoid duplicate files"
    
    This reverts commit 3e741dd3416c9c26a29a0a72418ea9fe467d68b6.
    
  - Add .gitignore file (#28)
    
    
  - Enhance new platform API (#19)
    
    * Changes of SONiC new platform API based on latest design
    
    * Moved get_change_event from DeviceBase to ChassisBase and ModuleBase
    
    * chassis_base.py : added get_change_event
    device_base.py : fixed typo
    fan_base.py : defined DEVICE_TYPE
    module_base.py : defined DEVICE_TYPE, fixed typo
    psu_base.py : defined DEVICE_TYPE
    sfp_base.py : defined DEVICE_TYPE, fixed typo, modified descriptions of set_power_override
    thermal_base.py : defined DEVICE_TYPE
    
    * module_base.py : modified get_change_event to return devices in nested dict
    
    * Added dom related status support for SFP, including temperature, voltage, TX bias, TX power and RX power
    
    * 1. Per channel return for TX bias, TX power and RX power in sfp_base.py.
    2. Support system EEPROM and serial number in chassis_base.py.
    
    * 1. Added SYS EEPROM functions to module_base.py.  2. Fixed typos.  3. Merge get_watchdog to return self._watchdog in chassis_base
    
    * 1. Fixed various typos.  2. Changed get_ampere to get_current, get_watt to get_power in psu_base.py
    
    * Changed get_system_eeprom return to use type code defined in ONIE TlvInfo EEPROM as the keys