examples: make glue and demo code compatible with 64-bit

Commit f9886bc60f42 ("Added arm64 assembly for examples/api crt0")
added a 64-bit target for the examples but did not adjust the demo
code to be 64-bit compatible.

Change variable size for pointers.
Use %p to print pointers.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/examples/api/glue.c b/examples/api/glue.c
index 0aaa82b..478f7b6 100644
--- a/examples/api/glue.c
+++ b/examples/api/glue.c
@@ -41,8 +41,8 @@
 int api_search_sig(struct api_signature **sig)
 {
 	unsigned char *sp;
-	uint32_t search_start = 0;
-	uint32_t search_end = 0;
+	uintptr_t search_start = 0;
+	uintptr_t search_end = 0;
 
 	if (sig == NULL)
 		return 0;