P11_Dev: vpd-manager WriteKeyword D-Bus API does not update Keyword value to Backup path for Bonnell like systems

[souvik1914581]

vpd-manager WriteKeyword API exposed on com.ibm.VPD.Manager interface updates a given keyword on following paths:

1. primary EEPROM
2. redundant EEPROM (if any present in sys config JSON)
3. D-Bus.

For systems like Bonnell which have Backup VPD on some other FRU's EEPROM, this API does not update the keyword value on the Backup path. This needs to be handled as Bonnell system is now in P11 scope. Also, we may have some other similar systems in future.