Revert "ARM: move signal handlers into a vdso-like page"

This reverts commit db8e3705414c213a8086d146c2274b1f16b56127

Change-Id: I7d79091cb7b2974b83a7f62ada6486f8dd5b2499
Revert "ARM: poison memory between kuser helpers"

This reverts commit 3d374dc4991c55bfef2c3dd0099fff1c4a48b792

Change-Id: I2353e696cdf0c892979c3a6f32d595faa00e9418
Revert "ARM: poison the vectors page"

This reverts commit 0d34bee27392ad54b63a3e1fd03b498c6757e6fb

Change-Id: I24311b2d20a4959f850da4fe780dd5d2b59e7e77
Merge "Revert "ARM: move signal handlers into a vdso-like page""
Merge "Revert "ARM: poison memory between kuser helpers""
Merge "Revert "ARM: poison the vectors page""
Revert "ARM: earlier initialization of vectors page"

This reverts commit 58524746d00d38867cd2e32fde7541d2ab7dd2b6

Change-Id: I2d9b52589e6b488e9ebff33a7aef2551634f5dc7
Revert "ARM: 7294/1: vectors: use gate_vma for vectors user mapping"

This reverts commit d3f44755fe308008bf244c379f6c64f437414184

Change-Id: I6b00973fab24de49e95ebf1c75d297a3540143a7
Merge "Revert "ARM: 7294/1: vectors: use gate_vma for vectors user mapping""
Merge "Revert "ARM: earlier initialization of vectors page""