configs: enable MbedTLS as default setting

Enable MbedTLS as default setting for qemu arm64

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
diff --git a/configs/qemu_arm64_defconfig b/configs/qemu_arm64_defconfig
index 7e166f4..22d3860 100644
--- a/configs/qemu_arm64_defconfig
+++ b/configs/qemu_arm64_defconfig
@@ -67,4 +67,7 @@
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_PCI=y
 CONFIG_SEMIHOSTING=y
+CONFIG_MBEDTLS_LIB=y
+CONFIG_MBEDTLS_LIB_CRYPTO=y
+CONFIG_MBEDTLS_LIB_X509=y
 CONFIG_TPM=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index dc5fcdb..c63059c 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -343,6 +343,9 @@
 CONFIG_FS_CRAMFS=y
 CONFIG_ADDR_MAP=y
 CONFIG_CMD_DHRYSTONE=y
+CONFIG_MBEDTLS_LIB=y
+CONFIG_MBEDTLS_LIB_CRYPTO=y
+CONFIG_MBEDTLS_LIB_X509=y
 CONFIG_ECDSA=y
 CONFIG_ECDSA_VERIFY=y
 CONFIG_TPM=y