pinctrl: single: set function name when adding function

pcs_add_function() fails to set the function name in struct pcs_function
when adding a new function. As a result this line in pcs_set_mux():

dev_dbg(pcs->dev, "enabling %s function%i\n",
func->name, fselector);

prints "(null)" for the function:

pinctrl-single 44e10800.pinmux: enabling (null) function0
pinctrl-single 44e10800.pinmux: enabling (null) function1
pinctrl-single 44e10800.pinmux: enabling (null) function2
pinctrl-single 44e10800.pinmux: enabling (null) function3

With this fix, the output is now:

pinctrl-single 44e10800.pinmux: enabling pinmux-uart0-pins function0
pinctrl-single 44e10800.pinmux: enabling pinmux-mmc0-pins function1
pinctrl-single 44e10800.pinmux: enabling pinmux-i2c0-pins function2
pinctrl-single 44e10800.pinmux: enabling pinmux-mmc0-pins function3

Cc: Jason Kridner <[e-mail]>
Cc: Robert Nelson <[e-mail]>
Cc: Linus Walleij <[e-mail]>
Cc: Tony Lindgren <[e-mail]>
Signed-off-by: Drew Fustini <[e-mail]>
Acked-by: Tony Lindgren <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-single.c

···
 
 	function->vals = vals;
 	function->nvals = nvals;
+	function->name = name;
 
 	selector = pinmux_generic_add_function(pcs->pctl, name,
 					       pgnames, npgnames,