armv8: fsl-layerscape: Fix SECURE_BOOT config

Without a prompt in Kconfig, SECURE_BOOT cannot be selected by
defconfig. The option was dropped unintentionally when defconfig
files were cleaned up. Three targets were impacted
ls1043ardb_SECURE_BOOT, ls2080ardb_SECURE_BOOT,
ls2080aqds_SECURE_BOOT.
Signed-off-by: NYork Sun <york.sun@nxp.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

arch/arm/cpu/armv8/fsl-layerscape/Kconfig

@@ -131,7 +131,7 @@ config MAX_CPUS
 	  in spin table to properly handle all cores.
 
 config SECURE_BOOT
-	bool
+	bool "Secure Boot"
 	help
 		Enable Freescale Secure Boot feature
 

configs/ls1043ardb_SECURE_BOOT_defconfig

 CONFIG_ARM=y
 CONFIG_TARGET_LS1043ARDB=y
+CONFIG_SECURE_BOOT=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1043a-rdb"
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y

configs/ls2080aqds_SECURE_BOOT_defconfig

 CONFIG_ARM=y
 CONFIG_TARGET_LS2080AQDS=y
+CONFIG_SECURE_BOOT=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls2080a-qds"
 # CONFIG_SYS_MALLOC_F is not set
 CONFIG_FIT=y

configs/ls2080ardb_SECURE_BOOT_defconfig

 CONFIG_ARM=y
 CONFIG_TARGET_LS2080ARDB=y
+CONFIG_SECURE_BOOT=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls2080a-rdb"
 # CONFIG_SYS_MALLOC_F is not set
 CONFIG_FIT=y