Fix some obvious typos across multiple subsystems.

Typoes fixed:

  "partion" -> "partition"
  "retrive", "retreive" -> "retrieve"
  "th" -> "to"

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
diff --git a/common/image-fit.c b/common/image-fit.c
index 199b4ed..7647515 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1331,7 +1331,7 @@
  *
  * When NULL is provided in second argument fit_conf_get_node() will search
  * for a default configuration node instead. Default configuration node unit
- * name is retrived from FIT_DEFAULT_PROP property of the '/configurations'
+ * name is retrieved from FIT_DEFAULT_PROP property of the '/configurations'
  * node.
  *
  * returns: