net: qede: Initialize qede_ll_ops with designated initializer

After a recent change [1] in clang's randstruct implementation to
randomize structures that only contain function pointers, there is an
error because qede_ll_ops get randomized but does not use a designated
initializer for the first member:

  drivers/net/ethernet/qlogic/qede/qede_main.c:206:2: error: a randomized struct can only be initialized with a designated initializer
    206 |         {
        |         ^

Explicitly initialize the common member using a designated initializer
to fix the build.

Cc: stable@vger.kernel.org
Fixes: 035f7f8 ("randstruct: Enable Clang support")
Link: llvm/llvm-project@04364fb [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250507-qede-fix-clang-randstruct-v1-1-5ccc15626fba@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>

Author: nathanchance

drivers/net/ethernet/qlogic/qede/qede_main.c

@@ -203,7 +203,7 @@ static struct pci_driver qede_pci_driver = {
 };
 
 static struct qed_eth_cb_ops qede_ll_ops = {
-	{
+	.common = {
 #ifdef CONFIG_RFS_ACCEL
 		.arfs_filter_op = qede_arfs_filter_op,
 #endif