Add speed limit control signals for Ioniq PHEV 2020

[devtekve]

Added SLC_ON and SLC_SET_SPEED signals to the ELECT_GEAR message.

Route: e1107f9d04dfb1e2/00000179--d93c2e7bc1

On my car,

• CF_Clu_SldMainSW is used for enabling speed limit mode.
• CF_Clu_SldMainSW is the same physical button as CF_Clu_CruiseMainSW, but goes rising edge on the second press of it
• When CF_Clu_SldMainSW goes rising edge, MainMode_ACC goes Falling Edge and SLC_ON (new) goes Rising Edge and stays like that until CF_Clu_SldMainSW is pressed once more.
• The SLC_SET_SPEED is the limit speed chosen on the dash. It was displayed in km/h for me but my car is EU. Not sure how it would look on American cars.
• The speed is controlled via the known set and res buttons

Footnote

Because this signal was missing, it causes a bad behavior with OP long control.


More about that https://discord.com/channels/469524606043160576/524611978208215070/1159242110281719859