ANDROID: GKI: add vendor hooks android_vh_page_should_be_protected() and

android_vh_modify_scan_control().

add two vendor hooks:
    android_vh_page_should_be_protected():protect pages from memory
reclaim.
    android_vh_page_referenced_check_bypass():bypass rmap in active list
shrink.

The new vendor data field in scan_control are used to track how many
pages are protected in current reclaim and the "protected / scanned"
rate. These parameters are useful for understanding the impact of page
protection operations on LRU and reclaim, helping us make better
decsions.

Bug: 348285765
Change-Id: I49567a4b1f978821a94da0a8339b2b8fdfd52daf
Signed-off-by: Yuxuan Yan <yanyuxuan3@xiaomi.corp-partner.google.com>