fix(arm): tf_config default to aarch64-only

Moving tf config from default to aarch64 only for
CTX_INCLUDE_AARCH32_REGS=0 setting for Foundation model. This config is
v8, but EL1 supports AArch64-only for the Foundation model that
supports v8+v9.

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I623f43704ec7d1cec4c74bf0485208403c806391
1 file changed