Revert "Slimbus: Fix slim-msm-ctrl's apr.h #include"

This reverts commit e950feacaf7e00904699642981f75eeee07e8058.
Revert "Add include/linux/qdsp6v2"

This reverts commit 9d076e2947607b8e3571f6eaae2df709107a9b71.
Revert "Update mach/qdsp6v2"

This reverts commit b161e8bb0fd65095e05c4c5a03cba1e0322fc9ba.
Revert "Clean up mach/qdspr6v2"

This reverts commit 5567847e792dce22fa2c91df850dcbd5a53a28cf.