pinctrl: broxton: Rename apl-pinctrl driver

While we have no users yet rename the platform driver to use the same
pattern as the rest of Intel SoCs, i.e. use full SoC name in
'apollolake-pinctrl'.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>