tegra: Boot in non-secure mode by default

Upstream Linux is broken with default configs when PSCI, thus non-secure
mode is enabled. So the user should explicitly enable this mode, e.g.
when she disabled CONFIG_CPU_IDLE in Linux (in which case it's safe to
use). We can revert this workaround once Linux got fixed.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/armv7/Kconfig

@@ -16,7 +16,7 @@ config ARMV7_NONSEC
 config ARMV7_BOOT_SEC_DEFAULT
 	boolean "Boot in secure mode by default" if EXPERT
 	depends on ARMV7_NONSEC
-	default n
+	default y if TEGRA
 	---help---
 	Say Y here to boot in secure mode by default even if non-secure mode
 	is supported. This option is useful to boot kernels which do not