pinctrl: baytrail: reduce scope of spinlock in ->dbg_show() hook

pinctrl: baytrail: reduce scope of spinlock in ->dbg_show() hook

Reduce scope of spinlock to IO operations in ->dbg_show() hook
and save a few bytes.

add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-12 (-12)
Function                                     old     new   delta
byt_gpio_dbg_show                            890     878     -12
Total: Before=17029, After=17017, chg -0.07%

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20230616203356.27343-2-raag.jadav@intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>