dm: pinctrl: fix for introduce PINCONF_RECURSIVE option

Correct the name of the define used CONFIG_IS_ENABLED which is
not aligned with Kconfig name: CONFIG_$(SPL_)PINCONF_RECURSIVE.

The recursive calls is conditional only for UCLASS_PINCONFIG
"pinconfig" driver.
It is always needed to call pinctrl_post_bind for UCLASS_PINCTRL
"pinctrl", the test CONFIG_IS_ENABLED(PINCONF_RECURSIVE) need to
be removed for this driver.

This correct a regression introduced because the same patch is
applied twice times in u-boot-dm branch:
- commit e878b53a ("dm: pinctrl: introduce PINCONF_RECURSIVE
  option")
- commit c20851b3 ("dm: pinctrl: introduce PINCONF_RECURSIVE
  option")

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>