[media] staging: as102: Remove unnecessary typedefs

According to the kernel coding rules typedefs should be avoided,
so replace theit occurances with explicit enum/union types.

Cc: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Sylwester Nawrocki <snjw23@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>