Fix for build issue when Mixed Datatypes are disabled

- Warning is raised for the implicit declaration of bli_gemm_md_is_ccr()
  when BLIS is configured with --disable-mixed-dt flag.

- Encapsulated the usage of bli_gemm_md_is_ccr( ... ) inside the
  BLIS_ENABLE_GEMM_MD macro.

AMD-Internal: [CPUPL-4630]
Change-Id: Icc59b1bcd3a21492daaaf6bcec80a5bf67012ace

frame/3/gemm/bli_gemm_front_amd.c

@@ -5,7 +5,7 @@
    libraries.
 
    Copyright (C) 2014, The University of Texas at Austin
-   Copyright (C) 2018 - 2023, Advanced Micro Devices, Inc. All rights reserved.
+   Copyright (C) 2018 - 2024, Advanced Micro Devices, Inc. All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
@@ -136,9 +136,11 @@ void bli_gemm_front
 	// In case of dzgemm, if the microkernel prefers column output,
 	// we will induce a transposition and perform C+= A*B 
 	// where A( formerly B) is complex. Hence attach alpha to A.
+#ifdef BLIS_ENABLE_GEMM_MD
 	if ( bli_gemm_md_is_ccr( &a_local, &b_local, &c_local ))
 		bli_obj_scalar_attach( BLIS_NO_CONJUGATE, alpha, &a_local );
 	else
+#endif
 		bli_obj_scalar_attach( BLIS_NO_CONJUGATE, alpha, &b_local );
 
 	// Attach beta to C, and in the process typecast beta to the target