srx_extra1 not consistant with mavx_extra1

[jjmmss00]

In docs the selectable rate for mavx_extra1 is 0..50 while in mission planner only a rate of 0..10 is allowed for srx_extra1. There is no available selection for mavx_extra1 in MP, although I understand they should be the same. I note that in at least one online video a user is shown selecting 50hz in the full parameter list.

Feature request

Is your feature request related to a problem? Please describe.
The setup for various SIYI cameras request a setting of srx_extra1 to 50 ("x" depending on the serial port the camera is connected)

Describe the solution you'd like
change limits of srx_extra1 to be consistent with the limits state in ArduPilot docs for mavx_extra1.

Describe alternatives you've considered
possibly change the hard coded attitude output from 10 to 50 in AP_Mount_Siyi.cpp. In the update function (to an inexperienced reader) it appears that attitude is sent to gimbal at a hardcoded 10hz rate.

Platform
[ ] All
[ ] AntennaTracker
[ X] Copter
[ ] Plane
[ ] Rover
[ ] Submarine

Additional context
Add any other context or screenshots about the feature request here.

[peterbarker]

Ping @rmackay9 for his input on this one.

[magicrub]

I don't see why it's limited. All of them should allow up to 50.

[timtuxworth]

I don't see why it's limited. All of them should allow up to 50.

He seems to be asking for the limit to be relaxed on SRx_EXTRA1 to match 4.7, I think the simple answer is "use the full parameter list" in 4.6.

[jjmmss00]

. @here is screenshot of issue.