uncrustify: Add a rule to remove space inside function argument

Our code base doesn't have spaces both after the opening parenthesis
and the closing parenthesis.  "func( arg )" vs "func(arg)".

This patch adds the rule to remove the spaces.

Signed-off-by: Yasushi SHOJI <y-shoji@ispace-inc.com>

.uncrustify.cfg

@@ -50,6 +50,7 @@ sp_after_comma      = add
 sp_func_def_paren   = remove    # "int foo (){" vs "int foo(){"
 sp_func_call_paren  = remove    # "foo (" vs "foo("
 sp_func_proto_paren = remove    # "int foo ();" vs "int foo();"
+sp_inside_fparen    = remove    # "func( arg )" vs "func(arg)"
 sp_else_brace       = add       # ignore/add/remove/force
 sp_before_ptr_star  = add       # ignore/add/remove/force
 sp_after_ptr_star   = remove    # ignore/add/remove/force