arm: memory: Replace memory_region_init_ram with memory_region_allocate_system_memory

Commit 0b183fc871:"memory: move mem_path handling to
memory_region_allocate_system_memory" split memory_region_init_ram and
memory_region_init_ram_from_file. Also it moved mem-path handling a step
up from memory_region_init_ram to memory_region_allocate_system_memory.

Therefore for any board that uses memory_region_init_ram directly,
-mem-path is not supported.

Fix this by replacing memory_region_init_ram with
memory_region_allocate_system_memory.

Signed-off-by: Dirk Mueller <dmueller@suse.com>
Message-id: CAL5wTH4UHYKpJF=dLJfFzxpufjY189chnCow47-ySuLf8GLbug@mail.gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/arm/digic_boards.c b/hw/arm/digic_boards.c
index e576646..f8ba9e5 100644
--- a/hw/arm/digic_boards.c
+++ b/hw/arm/digic_boards.c
@@ -51,9 +51,8 @@
 
 static void digic4_board_setup_ram(DigicBoardState *s, hwaddr ram_size)
 {
-    memory_region_init_ram(&s->ram, NULL, "ram", ram_size, &error_abort);
+    memory_region_allocate_system_memory(&s->ram, NULL, "ram", ram_size);
     memory_region_add_subregion(get_system_memory(), 0, &s->ram);
-    vmstate_register_ram_global(&s->ram);
 }
 
 static void digic4_board_init(DigicBoard *board)