arm64: crypto: remove accidentally backported files

In the v4.9.y backport commit:

  5ac0682830b31c4fba72a208a3c1c4bbfcc9f7f8

  ("arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support")

... I accidentally added unrelated arm64/crypto files which were not
part of the upstream commit:

  b092201e0020614127f495c092e0a12d26a2116e

... and are not used at all in the v4.9.y tree.

This patch reverts the accidental addition. These files should not have
been backported, and having them in the v4.9.y tree is at best
confusing.

Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>