msm: vidc: use macro to get/set fields

[1] Use msm_vidc_plane_reserved_field_types for setting/getting
    plane reserve fields.
[2] Use msm_vidc_cb_event_types enum for setting/getting
    Seq_changed_event types.

Change-Id: Ie6cb908515c9714d26f00fdd25af2dfcd875d725
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>