Add support for building crypto for trusty

openssl.config: Sources new openssl.trusty.config

openssl.trusty.config: Trusty specific config variables.

import_openssh.sh:
 * Generate Crypto-trusty-config.mk
 * Generate build-config-trusty.mk
 * New ./Configure target to generate opensslconf-trusty.h

rules.mk: Trusty build system makefile. Uses *-trusty*.mk's generated by
import_openssl.sh.

Change-Id: I4a0c6c61ee2dea45adb4bdfcb36628b9671bbd7f