ci: update bl31 spmd prebuilt to TF-A v2.8

Update prebuilts submodule commit hash.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Iec60d907106e05b4b85f7400d473cec9ce22b472
diff --git a/test/hftest/hftest.py b/test/hftest/hftest.py
index e27a064..6c65b67 100755
--- a/test/hftest/hftest.py
+++ b/test/hftest/hftest.py
@@ -52,8 +52,8 @@
 FVP_PREBUILT_DTS = os.path.join(
     FVP_PREBUILTS_TFA_TRUSTY_ROOT, "fvp-base-gicv3-psci-1t.dts")
 
-FVP_PREBUILT_TFA_ROOT = os.path.join(
-    HF_PREBUILTS, "linux-aarch64", "trusted-firmware-a", "fvp")
+FVP_PREBUILT_TFA_SPMD_ROOT = os.path.join(
+    HF_PREBUILTS, "linux-aarch64", "trusted-firmware-a-spmd", "fvp")
 
 VM_NODE_REGEX = "vm[1-9]"
 
@@ -508,7 +508,7 @@
 
     @property
     def FVP_PREBUILT_BL31(self):
-        return os.path.join(FVP_PREBUILT_TFA_ROOT, "bl31_spmd.bin")
+        return os.path.join(FVP_PREBUILT_TFA_SPMD_ROOT, "bl31.bin")
 
     @property
     def SPMC_ADDRESS(self):
@@ -570,7 +570,7 @@
 
     @property
     def FVP_PREBUILT_BL31(self):
-        return str(os.path.join(FVP_PREBUILT_TFA_ROOT, "bl31_spmd.bin"))
+        return str(os.path.join(FVP_PREBUILT_TFA_SPMD_ROOT, "bl31.bin"))
 
     def create_dt(self, run_name):
         dt = dict()