Yieldmo requiring deprecated media param 'placement'

[pieisgood]

Prebid.js/modules/yieldmoBidAdapter.js

Line 604 in 6689373

const placement = validate('video.placement', val => isDefined(val), paramRequired);

This should be updated to support the new plcmt field and not have placement as a requirement since it is now deprecated.

[patmmccann]

@fowler446 we'd love for the video committee to weigh in on if requiring deprecated parameters should be disallowed in prebid 9

[fowler446]

We should absolutely drop this field from being required. Doesn't make sense to require a deprecated field.

[fowler446]

@desidiver any thoughts here? I don't think we should be requiring a deprecated field.

[fowler446]

Closing this issue in favour of this global list of needed placement changes
#10452