add MEMINFO_SWAP_CACHED in 'cached kernel memory'

In LostRam equation, SwapCached is included in totalSwapPss,
and is subtracted with it. But SwapCached still occupies
memory and can be swapped out under system ram pressure.
So it makes sense to add it in cached kernel memory, and
this can make lostram calculation more accurate.

Test: dumpsys meminfo
Signed-off-by: shisiyuan <shisiyuan@lixiang.com>
(cherry picked from https://android-review.googlesource.com/q/commit:c51c79dc1a602216813a9d170475bb975589b856)
Merged-In: I564157331eafd23ab1581848735b75d87fa3c8d5
Change-Id: I564157331eafd23ab1581848735b75d87fa3c8d5