fix PULLUP(s)

[nerdCopter]

• fixes compiling of these targets
• unsure if they should also have #define USE_I2C_PULLUP

[ledvinap]

It seems that USE_I2C_PULLUP is used to enable pullups (on all ports). https://github.com/betaflight/betaflight/blob/master/src/main/target/common_defaults_post.h#L42-L52

[haslinghuis]

All targets changed in here only use a single I2C port definition. If we want to have more control we need to change firmware instead. But won't be needed at this point ???

We also have these targets using USE_I2C_PULLUP:

configs/CCRCF435AIO/config.h:101:#define USE_I2C_PULLUP
configs/MERCURYG4/config.h:106:#define USE_I2C_PULLUP
configs/NEUTRONRCF435MINI/config.h:101:#define USE_I2C_PULLUP
configs/DARWINF435/config.h:100:#define USE_I2C_PULLUP

[nerdCopter]

whatever ya'll want. let me know how to modify this PR.

[haslinghuis]

If we fix it in firmware it will apply to firmware 4.5.2 / 4.6 only.

[ot0tot]

Is this needed? The internal I2C pullups are very weak, I'm not sure enabling them does anything. There should be external pullups on the FC for I2C.