ANDROID: arm64: gki_defconfig: disable CONFIG_ZONE_DMA32

We don't need this. So disable to improve the ABI diff with vendors.

Bug: 150898578
Test: build
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I16568f2a1a04a0e4733470f2a4f92a451729682a