spd: trusty: support for AARCH64 mode
spd: trusty: support for AARCH64 mode

This patch removes support for running Trusty in the AARCH32 mode as
all platforms use it in only AARCH64 mode.

Signed-off-by: Varun Wadekar <517ae08f01cae398dbba5bef5ba1750f384c6daf@nvidia.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware,sbranden/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,lsigithub/arm-trusted-firmware_public,sbranden/arm-trusted-firmware