sandbox: Fix warnings due to 64-bit printf() strings

Now that we have inttypes.h, use it in a few more places to avoid compiler
warnings on sandbox when building on 64-bit machines.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_mem.c b/common/cmd_mem.c
index 0d50dcf..bcb3ee3 100644
--- a/common/cmd_mem.c
+++ b/common/cmd_mem.c
@@ -19,6 +19,7 @@
 #include <dataflash.h>
 #endif
 #include <hash.h>
+#include <inttypes.h>
 #include <watchdog.h>
 #include <asm/io.h>
 #include <linux/compiler.h>
@@ -338,7 +339,8 @@
 		if (word1 != word2) {
 			ulong offset = buf1 - base;
 #ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
-			printf("%s at 0x%p (%#0*llx) != %s at 0x%p (%#0*llx)\n",
+			printf("%s at 0x%p (%#0*"PRIx64") != %s at 0x%p (%#0*"
+			       PRIx64 ")\n",
 			       type, (void *)(addr1 + offset), size, word1,
 			       type, (void *)(addr2 + offset), size, word2);
 #else
@@ -1146,7 +1148,7 @@
 			printf(" %08x", *((u32 *)ptr));
 #ifdef CONFIG_SYS_SUPPORT_64BIT_DATA
 		else if (size == 8)
-			printf(" %016llx", *((u64 *)ptr));
+			printf(" %016" PRIx64, *((u64 *)ptr));
 #endif
 		else if (size == 2)
 			printf(" %04x", *((u16 *)ptr));