RHEL9 uses RHEL8 roofline binary (#208)

Signed-off-by: JoseSantosAMD <Jose.Santos@amd.com>

src/omniperf

@@ -308,9 +308,9 @@ def detect_roofline():
             print("ROOFLINE ERROR: user-supplied path to binary not accessible")
             print("--> ROOFLINE_BIN = %s\n" % target_binary)
             sys.exit(1)
-    elif rhel_distro == "platform:el8":
+    elif rhel_distro == "platform:el8" or rhel_distro == "platform:el9":
         # Must be a valid RHEL machine
-        distro = rhel_distro
+        distro = "platform:el8"
     elif (
         (type(sles_distro) == str and len(sles_distro) >= 3) and # confirm string and len
         sles_distro[:2] == "15" and int(sles_distro[3]) >= 3 # SLES15 and SP >= 3