[Trainer] fix SP loss

[kashif]

What does this PR do?

for SP loss we do not have torch device mesh but rather a deepspeed only.

Fixes # (issue)

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[SunMarc]

yes sorry, my previous pr reverted this change by mistake

[SunMarc]

it will be fixed here but we can merge this do unblock you : #44338

[kashif]

ok i have added your changes here

[kashif]

@SunMarc sorry for the confusion, shall i close this?

[SunMarc]

Thanks again

[SunMarc]

We can merge this !

[kashif]

thank you @SunMarc