ANDROID: GKI: Add hooks for sk_alloc.

The vendor module will use 'android_vh_sk_alloc' to
mark some flag bits during sock initialization, and handle
the sock differently based on the flag bit status to ensure
the optimal network experience for the user.
We also use 'android_vh_sk_alloc' to destroy flag bit
information together when the sock is destroyed.

Bug: 345658543
Change-Id: Iae212a391b27848154bd8d5b615a867e76f33e3f
Signed-off-by: Dezhi Huang <huangdezhi@hihonor.com>