pinctrl: actions: Fix functions groups names for S700 SoC

Group names by function do not match their respective structures and
documentation defined names.

This fixes following errors when groups names defined on documentation are used:
[    4.262778] pinctrl-s700 e01b0000.pinctrl: invalid group "sd0_d1_mfp" for function "sd0"
[    4.271394] pinctrl-s700 e01b0000.pinctrl: invalid group "sd0_d2_d3_mfp" for function "sd0"
[    4.280248] pinctrl-s700 e01b0000.pinctrl: invalid group "sd1_d0_d3_mfp" for function "sd0"
[    4.289122] pinctrl-s700 e01b0000.pinctrl: invalid group "sd0_cmd_mfp" for function "sd0"

Fixes: 81c9d563 (pinctrl: actions: Add Actions Semi S700 pinctrl driver)
Signed-off-by: Matheus Castello <matheus@castello.eng.br>
Link: https://lore.kernel.org/r/20200124133758.10089-1-matheus@castello.eng.brReviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>