ARM: tegra: Enable Trusted Foundations by default

Support for the Trusted Foundations firmware was recently moved outside
of arch/arm and now needs to be selected explicitly. Since some 32-bit
Tegra devices use this firmware, enable support for it in the default
configuration.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/configs/tegra_defconfig

@@ -27,6 +27,7 @@ CONFIG_CPUFREQ_DT=y
 CONFIG_CPU_IDLE=y
 CONFIG_VFP=y
 CONFIG_NEON=y
+CONFIG_TRUSTED_FOUNDATIONS=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y