Add driver API reentrancy support to GPIO shim drivers

[zephyrbot]

Reported by Kuo-Lang Tseng:

Global data and device IO registers being set by the driver API can be messed up in the middle of the API call when a concurrent call (from other fiber/task) to the same API is made.

(Imported from Jira ZEP-441)

[zephyrbot]

by Jing Wang:

Make gpio_pin_write and gpio_pin_read run in parallel respectively from different context. There is no reentrancy issue.