vendorcode/cavium: Use C99 flexible arrays

Use C99 flexible arrays instead of older style of one-element or
zero-length arrays.
It allows the compiler to generate errors when the flexible array does
not occur at the end in the structure.

Change-Id: I19c029968584fedbb6749e66c7ea2f74a7d580f4
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76811
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/vendorcode/cavium/bdk/libbdk-hal/bdk-nic.c

@@ -80,7 +80,7 @@ typedef struct
     int next_free_cpi;
     int next_free_rssi;
     int next_free_bpid;
-    nic_t *nic_map[0]; /* Indexed by handle->nic_id */
+    nic_t *nic_map[]; /* Indexed by handle->nic_id */
 } nic_node_state_t;
 
 static nic_node_state_t *global_node_state[BDK_NUMA_MAX_NODES];

src/vendorcode/cavium/include/bdk/libbdk-hal/if/bdk-if.h

@@ -153,7 +153,7 @@ typedef struct __bdk_if_port
     char        name[16];
     struct __bdk_if_port *next;
     struct __bdk_if_port *poll_next;
-    char        priv[0];
+    char        priv[];
 } __bdk_if_port_t;
 
 typedef __bdk_if_port_t *bdk_if_handle_t;