media: remap the addr to prevent crash on the 32bit & 2G board [1/1]

media: remap the addr to prevent crash on the 32bit & 2G board [1/1]

PD#SWPL-1909

Problem:
mem rw exception caused crashed.

Solution:
1. add mapping the highmem address by the func vmap().
2. remove the flag CODEC_MM_FLAGS_CPU if not necessary.

Verify:
p212, w400

Change-Id: I982c775d7c009335cae5802f0eb6287d22037db6
Signed-off-by: Nanxin Qin <nanxin.qin@amlogic.com>