SQUAD: Update label names of memory footprint data

Rename tfms_* to spe_* to make SQUAD metrics more readable.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I3c22fa4937a6c79dc8253f73eb40c52ea3992cd7
diff --git a/memory_footprint.py b/memory_footprint.py
index 3dc2b1c..05c1958 100644
--- a/memory_footprint.py
+++ b/memory_footprint.py
@@ -50,11 +50,11 @@
                                "bl2_ro_data"      : bl2_sizes["RO Data"],
                                "bl2_rw_data"      : bl2_sizes["RW Data"],
                                "bl2_zi_data"      : bl2_sizes["ZI Data"],
-                               "tfms_code_size"   : tfms_sizes["Code"],
-                               "tfms_inline_data" : tfms_sizes["Inline Data"],
-                               "tfms_ro_data"     : tfms_sizes["RO Data"],
-                               "tfms_rw_data"     : tfms_sizes["RW Data"],
-                               "tfms_zi_data"     : tfms_sizes["ZI Data"]})
+                               "spe_code_size"    : tfms_sizes["Code"],
+                               "spe_inline_data"  : tfms_sizes["Inline Data"],
+                               "spe_ro_data"      : tfms_sizes["RO Data"],
+                               "spe_rw_data"      : tfms_sizes["RW Data"],
+                               "spe_zi_data"      : tfms_sizes["ZI Data"]})
     except:
         return -1