Revert "ARM: mm: Skip I-cache invalidate for Cortex-A15 boot"

This reverts commit ffbc55eae224fabd4f777975672d2cff806d8fb8.
Revert "ARM: mm: Remove unnecessary CMO in Cortex A15 startup"

This reverts commit ee5df9c07f531babc40fc83d25e960af4a4d5ce9.
Revert "ARM: cleanup undefined instruction entry code"

This reverts commit 014a9538af3732e166cdd2f20d893372f60f67f3.