scripts: headers_install: Add sysstats.h and taskstats.h into the bypass list

Add sysstats.h taskstats.h into the temporary bypass list. It should be removed
later once the CONFIG_* checks gets merged.

CRs-Fixed: 2664401
Change-Id: Icfedb19b22dcf59d4ae0e8d7bd9fddfc762d9731
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>