pinctrl: aspeed: g6: Remove const specifier from aspeed_g6_sig_expr_set's ctx parameter

clang errors:

drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c:2325:9: error: incompatible
pointer types initializing 'int (*)(struct aspeed_pinmux_data *, const
struct aspeed_sig_expr *, bool)' with an expression of type 'int (const
struct aspeed_pinmux_data *, const struct aspeed_sig_expr *, bool)'
[-Werror,-Wincompatible-pointer-types]
        .set = aspeed_g6_sig_expr_set,
               ^~~~~~~~~~~~~~~~~~~~~~
1 error generated.

Commit 674fa8da ("pinctrl: aspeed-g5: Delay acquisition of regmaps")
changed the set function pointer declaration and the g6 one wasn't
updated (I assume because it wasn't merged yet).

Fixes: 2eda1cde ("pinctrl: aspeed: Add AST2600 pinmux support")
Link: https://github.com/ClangBuiltLinux/linux/issues/632Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Link: https://lore.kernel.org/r/20190807003037.48457-1-natechancellor@gmail.comReviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c

@@ -2267,7 +2267,7 @@ static const struct aspeed_pin_function aspeed_g6_functions[] = {
  * Return: 0 if the expression is configured as requested and a negative error
  * code otherwise
  */
-static int aspeed_g6_sig_expr_set(const struct aspeed_pinmux_data *ctx,
+static int aspeed_g6_sig_expr_set(struct aspeed_pinmux_data *ctx,
 				  const struct aspeed_sig_expr *expr,
 				  bool enable)
 {