Move bootorder and bootoption apis to lib

Rename and move bootorder and bootoption apis from cmd to lib
for re-use between eficonfig and bootmgr
Fix 'unexpected indentation' when 'make htmldocs' after functions
are moved

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>