net: stmmac: xgmac: use #define for string constants

commit 1692b977 upstream.

The cited commit introduces and uses the string constants dpp_tx_err and
dpp_rx_err. These are assigned to constant fields of the array
dwxgmac3_error_desc.

It has been reported that on GCC 6 and 7.5.0 this results in warnings
such as:

  .../dwxgmac2_core.c:836:20: error: initialiser element is not constant
   { true, "TDPES0", dpp_tx_err },

I have been able to reproduce this using: GCC 7.5.0, 8.4.0, 9.4.0 and 10.5.0.
But not GCC 13.2.0.

So it seems this effects older compilers but not newer ones.
As Jon points out in his report, the minimum compiler supported by
the kernel is GCC 5.1, so it does seem that this ought to be fixed.

It is not clear to me what combination of 'const', if any, would address
this problem.  So this patch takes of using #defines for the string
constants

Compile tested only.

Fixes: 46eba193

 ("net: stmmac: xgmac: fix handling of DPP safety error for DMA channels")
Reported-by: Jon Hunter <jonathanh@nvidia.com>
Closes: https://lore.kernel.org/netdev/c25eb595-8d91-40ea-9f52-efa15ebafdbc@nvidia.com/
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402081135.lAxxBXHk-lkp@intel.com/
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240208-xgmac-const-v1-1-e69a1eeabfc8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>