Use bitfield instead of bool in struct
Refer to coding-style.rst 17) Using bool:
"If a structure has many true/false values, consider consolidating
them into a bitfield with 1 bit members, or using an appropriate
fixed width type, such as u8."
Due to @has_ippc's default vaule is 0, no need set it again if fail
to get ippc base address[...]
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>