Revert "Remove unnecessary ‘rustfmt’ symlink"

Revert "Make `rustfmt` available for other modules"

Revert submission 2079623-pdl-rustfmt

Reason for revert: b/232531894 - broken build
Reverted Changes:
Icba16d7a5:Remove unnecessary ‘rustfmt’ symlink
I4d08a8fd7:Make `rustfmt` available for other modules

Change-Id: I6103cf5db4899537e116964ea3dae17c197da6df