fbootk: Use /tmp/ path and remove duplicates
fbootk: Use /tmp/ path and remove duplicates

 * Allows using the tool from Android userspace

Change-Id: Ib31690c2c56b6f384799462a7ccbdb70536e426b
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools