u/debug: Use system property on Android for debug settings

Co-authored-by: Jakob Bornecrantz <jakob@collabora.com>

src/xrt/auxiliary/util/u_debug.c

@@ -19,6 +19,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef XRT_OS_ANDROID
+#include <sys/system_properties.h>
+#endif
+
 
 DEBUG_GET_ONCE_BOOL_OPTION(print, "XRT_PRINT_OPTIONS", false)
 
@@ -44,6 +48,39 @@ get_option_raw(char *chars, size_t char_count, const char *name)
 	return chars;
 }
 
+#elif defined XRT_OS_ANDROID
+
+struct android_read_arg
+{
+	char *chars;
+	size_t char_count;
+};
+
+static void
+android_on_property_read(void *cookie, const char *name, const char *value, uint32_t serial)
+{
+	struct android_read_arg *a = (struct android_read_arg *)cookie;
+
+	snprintf(a->chars, a->char_count, "%s", value);
+}
+
+static const char *
+get_option_raw(char *chars, size_t char_count, const char *name)
+{
+	char prefixed[1024];
+	snprintf(prefixed, ARRAY_SIZE(prefixed), "debug.xrt.%s", name);
+
+	const struct prop_info *pi = __system_property_find(prefixed);
+	if (pi == NULL) {
+		return NULL;
+	}
+
+	struct android_read_arg a = {.chars = chars, .char_count = char_count};
+	__system_property_read_callback(pi, &android_on_property_read, &a);
+
+	return chars;
+}
+
 #elif defined XRT_OS_LINUX
 
 static const char *