gpio: show gpio direction and egde in string.
gpio: show gpio direction and egde in string.

In gpio sysfs, direction and egde is shown in string.
dierction value is "in" or "out".
And egde value is "none", "falling", "rising" or "both".
So string must be shown also in powerdebug tool.

Signed-off-by: Shaojie Sun <13eedc311dabb3bd0bf974d69ad8b3348dba2166@linaro.com>

yinquan529/platform-external-powerdebug,gromaudio/android_external_powerdebug,gromaudio/android_external_powerdebug,yinquan529/platform-external-powerdebug