OpenBMC: Fix image upload
OpenBMC: Fix image upload

We need to not send it as part of a form, just as data

Fixes: c5c6442b44c5162ac9f15400e054490dd16210d4
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework