Disable Generic.Formatting.SpaceAfterCast

This was enabled without sufficient discussion. Let's not
use phpcs to enforce this. Instead there's enough other
rule violations to worry about. Once our code base actually
has this consistently and agreed upon in coding style, then
we can enable it here to enforce it for newly committed code.

Bug: 48450
Change-Id: Ied10f203af5dcff45893bb0246cb6a0469728cb3