ion: add invalid cache function [1/1]

ion: add invalid cache function [1/1]

PD#SWPL-3736

Problem:
H265 encoder use ge2d to do format convert, ge2d dst
buffer is allocated from ion heap and is cached buffer.
The cache consistency problem caused encoded stream error.

Solution:
ION add invalid cache function, invalid cache before
CPU access cache buffer

Verify:
U212

Change-Id: Ib14f2a9ee5b536c3546c5957fd0505cacae45f80
Signed-off-by: Yao.Liu <yao.liu@amlogic.com>