gpio: enhance exception handling in interface function

gpio: enhance exception handling in interface function

 - GPIO set type functions require prerequisites

 1) [edge_mode]                [direction]

    none ----------------------> in, out (O)

    rising, falling, both -----> in (O)
                           \
                            ---> out (X)

 2) [direction]                [edge_mode]

    in ------------------------> none, rising, falling, both (O)

    out -----------------------> none (O)
              \
               ----------------> rising, falling, both (X)

 3) [direction]                [value]

    in ------------------------> read (O)
              \
               ----------------> write (X)

    out -----------------------> read, write (O)

Change-Id: I72f8557568916b01c1e2e9edef79ed79f5bb20e6
Signed-off-by: Segwon <segwon.han@samsung.com>