MAINTAINERS: Remove Laura Abbott from DMA-BUF HEAPS FRAMEWORK

MAINTAINERS: Remove Laura Abbott from DMA-BUF HEAPS FRAMEWORK

Laura's email address has not been valid for quite awhile now,
so wanted to clean up the reviewer list here.

I reached out to Laura who said it made sense to drop her from
the list, so this patch does that.

I do want to recognize Laura's long time contribution to this
area and her previous ION maintainership, as this couldn't
have gone upstream without her prior efforts. Many thanks!

Cc: Laura Abbott <labbott@kernel.org>
Cc: T.J. Mercier <tjmercier@google.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: John Stultz <jstultz@google.com>
Cc: linux-media@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: kernel-team@android.com
Acked-by: Laura Abbott <labbott@kernel.org>
Signed-off-by: John Stultz <jstultz@google.com>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230630162111.3051783-1-jstultz@google.com