UPSTREAM: ARM: 8319/1: advertise availability of v8 Crypto instructions

When running the 32-bit ARM kernel on ARMv8 capable bare metal (e.g.,
32-bit Android userland and kernel on a Cortex-A53), or as a KVM guest
on a 64-bit host, we should advertise the availability of the Crypto
instructions, so that userland libraries such as OpenSSL may use them.
(Support for the v8 Crypto instructions in the 32-bit build was added
to OpenSSL more than six months ago)

This adds the ID feature bit detection, and sets elf_hwcap2 accordingly.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
(cherry picked from commit a092aedb8115c16cb49bc64dd09cb20471ff942b)
Change-Id: I14b20ebdaad29812fbbdb7bfc3661531950a54aa
Signed-off-by: Eric Biggers <ebiggers@google.com>