Revert "ANDROID: GKI: net: add vendor hooks for 'struct sock' lifecycle"

This reverts commit 0ed7424f.

The hooks android_rvh_sk_alloc and android_rvh_sk_free are not used by
any vendor, so remove them to help with merge issues with future LTS
releases.

If this is needed by any real user, it can easily be reverted to add it
back and then the symbol should be added to the abi list at the same
time to prevent it from being removed again later.

Bug: 203756332
Bug: 171013716
Cc: Vignesh Saravanaperumal <vignesh1.s@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I5fa860e75a0640bc02d1dffeb556497badd6f3bf