WiringPi: Minor changes

- Fix compile warning
- Remove pwmSetMode function that is not used
- Change the name of changing drive functions
- Aggressively use of WiringPi setupCheck() function
- Move usingGpiomem variable into libodroid structure
- etc...

Signed-off-by: Deokgyu Yang <secugyu@gmail.com>
Change-Id: I355556975cedc686885f3b91d7f1a4ec02f1e232
10 files changed