pinctrl: starfive: Rename "pinctrl-starfive" to "pinctrl-starfive-jh7100"

Add the SoC name to make it more clear. Also the next generation StarFive
SoCs will use "pinctrl-starfive" as the core of StarFive pinctrl driver.
No functional change.

Signed-off-by: Jianlong Huang <jianlong.huang@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@linux.starfivetech.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220930061404.5418-1-hal.feng@linux.starfivetech.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>