Build: Correcrt CONFIG_TFM_FP cmake parameter

Fix wrong cmake parameter CONFIG_TFM_SPE_FP as CONFIG_TFM_FP.

Signed-off-by: Feder Liang <feder.liang@arm.com>
Change-Id: Iacd7f426c863deef79be27ab4afd868f8a46d50a
diff --git a/toolchain_GNUARM.cmake b/toolchain_GNUARM.cmake
index 7645f58..654d5bb 100644
--- a/toolchain_GNUARM.cmake
+++ b/toolchain_GNUARM.cmake
@@ -76,8 +76,8 @@
             endif()
         endif()
         if(GCC_VERSION VERSION_GREATER_EQUAL "8.0.0")
-            if (DEFINED CONFIG_TFM_SPE_FP)
-                if(CONFIG_TFM_SPE_FP STREQUAL "0" AND
+            if (DEFINED CONFIG_TFM_FP)
+                if(CONFIG_TFM_FP STREQUAL "0" AND
                    NOT TFM_SYSTEM_ARCHITECTURE STREQUAL "armv6-m")
                     string(APPEND CMAKE_SYSTEM_PROCESSOR "+nofp")
                 endif()