aspeed/sdmc: Add trace events

This is useful to analyze changes in the U-Boot RAM driver when SDRAM
training is performed.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/misc/aspeed_sdmc.c

@@ -130,6 +130,7 @@ static uint64_t aspeed_sdmc_read(void *opaque, hwaddr addr, unsigned size)
         return 0;
     }
 
+    trace_aspeed_sdmc_read(addr, s->regs[addr]);
     return s->regs[addr];
 }
 
@@ -148,6 +149,7 @@ static void aspeed_sdmc_write(void *opaque, hwaddr addr, uint64_t data,
         return;
     }
 
+    trace_aspeed_sdmc_write(addr, data);
     asc->write(s, addr, data);
 }