all: Convert mp_uint_t to mp_unary_op_t/mp_binary_op_t where appropriate

The unary-op/binary-op enums are already defined, and there are no
arithmetic tricks used with these types, so it makes sense to use the
correct enum type for arguments that take these values.  It also reduces
code size quite a bit for nan-boxing builds.
diff --git a/py/objarray.c b/py/objarray.c
index a31c536..d51cc65 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -231,7 +231,7 @@
 }
 #endif
 
-STATIC mp_obj_t array_unary_op(mp_uint_t op, mp_obj_t o_in) {
+STATIC mp_obj_t array_unary_op(mp_unary_op_t op, mp_obj_t o_in) {
     mp_obj_array_t *o = MP_OBJ_TO_PTR(o_in);
     switch (op) {
         case MP_UNARY_OP_BOOL: return mp_obj_new_bool(o->len != 0);
@@ -240,7 +240,7 @@
     }
 }
 
-STATIC mp_obj_t array_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
+STATIC mp_obj_t array_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
     mp_obj_array_t *lhs = MP_OBJ_TO_PTR(lhs_in);
     switch (op) {
         case MP_BINARY_OP_ADD: {