crypto: Move CONFIG_SYS_FSL_SEC_LE and _BE to Kconfig

Use Kconfig option to set little- or big-endian access to secure
boot and trust architecture.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9fc1d5c..853e265 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -24,6 +24,7 @@
 	bool "MPC83xx"
 	select CREATE_ARCH_SYMLINK
 	select SYS_FSL_HAS_SEC
+	select SYS_FSL_SEC_BE
 	select SYS_FSL_SEC_COMPAT_2
 
 config MPC85xx