ANDROID: vendor_hooks: Add hooks to extend the struct swap_info_struct

This reverts commit: d0590b99

The hooks android_vh_init_swap_info_struct and android_vh_alloc_si
are deleted, due to the symbols are not added to the abi list. The
symbols are added to the abi list in patch:2183484. This patch is to
add the hooks android_vh_init_swap_info_struct and android_vh_alloc_si
again.

Bug: 234214858
Bug: 203756332
Cc: Greg Kroah-Hartman <gregkh@google.com>
Signed-off-by: Bing Han <bing.han@transsion.com>
Change-Id: Id5524a726d213c5eab55570fd28d28da978974e7