lib: optee: remove the duplicate CONFIG_OPTEE

The configuration CONFIG_OPTEE is defined 2 times:
1- in lib/optee/Kconfig for support of OPTEE images loaded by bootm command
2- in drivers/tee/optee/Kconfig for support of OP-TEE driver.

It is abnormal to have the same CONFIG define for 2 purpose;
and it is difficult to managed correctly their dependencies.

Moreover CONFIG_SPL_OPTEE is defined in common/spl/Kconfig
to manage OPTEE image load in SPL.

This definition causes an issue with the macro CONFIG_IS_ENABLED(OPTEE)
to test the availability of the OP-TEE driver.

This patch cleans the configuration dependency with:
- CONFIG_OPTEE_IMAGE (renamed) => support of OP-TEE image in U-Boot
- CONFIG_SPL_OPTEE_IMAGE (renamed) => support of OP-TEE image in SPL
- CONFIG_OPTEE (same) => support of OP-TEE driver in U-Boot
- CONFIG_OPTEE_LIB (new) => support of OP-TEE library

After this patch, the macro have the correct behavior:
- CONFIG_IS_ENABLED(OPTEE_IMAGE) => Load of OP-TEE image is supported
- CONFIG_IS_ENABLED(OPTEE) => OP-TEE driver is supported

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/include/tee/optee.h b/include/tee/optee.h
index ebdfe5e..2928597 100644
--- a/include/tee/optee.h
+++ b/include/tee/optee.h
@@ -43,7 +43,7 @@
 	return optee_image_get_entry_point(hdr) - sizeof(struct optee_header);
 }
 
-#if defined(CONFIG_OPTEE)
+#if defined(CONFIG_OPTEE_IMAGE)
 int optee_verify_image(struct optee_header *hdr, unsigned long tzdram_start,
 		       unsigned long tzdram_len, unsigned long image_len);
 #else
@@ -57,7 +57,7 @@
 
 #endif
 
-#if defined(CONFIG_OPTEE)
+#if defined(CONFIG_OPTEE_IMAGE)
 int optee_verify_bootm_image(unsigned long image_addr,
 			     unsigned long image_load_addr,
 			     unsigned long image_len);
@@ -70,7 +70,7 @@
 }
 #endif
 
-#if defined(CONFIG_OPTEE) && defined(CONFIG_OF_LIBFDT)
+#if defined(CONFIG_OPTEE_LIB) && defined(CONFIG_OF_LIBFDT)
 int optee_copy_fdt_nodes(void *new_blob);
 #else
 static inline int optee_copy_fdt_nodes(void *new_blob)