Revert "arch/arm/kernel/armksyms: fix merge derp"

This reverts commit 985df8f61fe6f1af0b59ed9627186532e25d6bd2.
Revert "ARM: use generic strnlen_user and strncpy_from_user functions"

This reverts commit 8629dbbc6423bef26ab0fbf23e95626f490165ce.
Revert "lib: Fix generic strnlen_user for 32-bit big-endian machines"

This reverts commit bd2bc8420fd386015014bc25d20e508b8bdd1f3e.
Revert "ib: add generic strnlen_user() function"

This reverts commit 2b52a5010e2ecedb9427844f12d87c314e33cffe.