Revert "ARM: tegra: Fix flow controller accesses"

This reverts commit a8ed624ecbada854c9f3ad3589dcafebd1844c1d.
Revert "ARM: tegra: functions to access the flowcontroller"

This reverts commit 90a0f0e1003bdd2f0b8c6c2438f031f9aaafb23b.