Revert half of "ANDROID: gic-v3: Add vendor hook to GIC v3"

This reverts parts of commit 00c6f53e.

The hook android_vh_gic_v3_affinity_init is not used by any vendor, so
remove it 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: 172637074
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I30cc4ebf738b77c2ea48df1d74ef5663f0ae1be6