[SUGGESTION] Permit manually add the i2c values

[hellresistor]

Hello friend, I am give a sugestion to upgrade the Addon about enabling i2c

I think will be very good exists an field to manually add values. Some people needs add more parameters like

dtparam=i2c_arm=on
dtoverlay=i2c-rtc,ds1307,addr=0x68
dtoverlay=dwc2,dr_mode=host

hope you understand what i mean.

Thank you

[adamoutler]

Submit a pull request. I can't theorize about how this will work.

[hellresistor]

updated ;)