Convert CONFIG_ARMV7_SECURE_BASE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_ARMV7_SECURE_BASE
   CONFIG_ARMV7_SECURE_MAX_SIZE
   CONFIG_ARMV7_SECURE_RESERVE_SIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mx7ulp_evk_plugin_defconfig b/configs/mx7ulp_evk_plugin_defconfig
index 0f8e9e8..a152c6e 100644
--- a/configs/mx7ulp_evk_plugin_defconfig
+++ b/configs/mx7ulp_evk_plugin_defconfig
@@ -10,6 +10,7 @@
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="imx7ulp-evk"
 CONFIG_TARGET_MX7ULP_EVK=y
+# CONFIG_HAS_ARMV7_SECURE_BASE is not set
 CONFIG_SYS_LOAD_ADDR=0x60800000
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="mmc dev ${mmcdev}; if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; fi; fi; fi"