Test compile flag CFG_REE_FS to know if REE FS is enabled

optee_os commit b44708c1c842 ("core: secure storage: dual filesystem
support") [1] has introduced a config flag for the availability of the
REE filesystem, so use it.

[1] https://github.com/OP-TEE/optee_os/commit/b44708c1c842

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Reviewed-by: Pascal Brand <pascal.brand@linaro.org>
diff --git a/host/xtest/Makefile b/host/xtest/Makefile
index 925cd17..4c3b2cf 100644
--- a/host/xtest/Makefile
+++ b/host/xtest/Makefile
@@ -114,8 +114,8 @@
 ifeq ($(CFG_ENC_FS),y)
 CFLAGS += -DCFG_ENC_FS
 endif
-ifeq ($(CFG_RPMB_FS),y)
-CFLAGS += -DCFG_RPMB_FS
+ifeq ($(CFG_REE_FS),y)
+CFLAGS += -DCFG_REE_FS
 endif
 
 ifndef CFG_GP_PACKAGE_PATH