pinctrl: single: Move test PCS_HAS_PINCONF in pcs_parse_bits_in_pinctrl_entry() to the beginning

The value of pcs->flags is not overwritten in function
pcs_parse_bits_in_pinctrl_entry() and its subfunctions, so moving this
check to the beginning of the function eliminates unnecessary rollback
operations.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210722033930.4034-3-thunder.leizhen@huawei.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>