ci: Update to QDL loading mode on sm8750-mtp

Update build loading mode to QDL on sm8750-mtp

Signed-off-by: Salendarsingh Gaud <sgaud@qti.qualcomm.com>

Author: sgaud-quic

ci/MACHINES.json

@@ -37,7 +37,7 @@
     "buildid": "",
     "firmwareid": "sm8750-mtp",
     "rootfs": "sm8750-mtp",
-    "flash_type": "fastboot"
+    "flash_type": "qdl"
   },
   "lemans-evk": {
     "machine": "lemans-evk",