[ROCm] Remove gfx900 from base docker build and Pytorch build scripts (#80015)
CI doesn't have any MI25s anymore. Should improve docker and Pytorch build times in CI for ROCm.
Will take out of Draft mode after https://github.com/pytorch/pytorch/pull/79596 is merged
Pull Request resolved: https://github.com/pytorch/pytorch/pull/80015
Approved by: https://github.com/jeffdaily, https://github.com/malfet
