Revert "kleaf: register Clang Python toolchain by default"

This reverts commit c4cfb73aa00fd34662249c9dd97b9257c52541f1.

Reason for revert: Potential build break in b/540358214

Bug: 540358214
Bug: 526725799
Change-Id: I2769888173d402ff80cd1a1e29efafed97261790
2 files changed