MAINTAINERS: Remove JZ4780 DMA driver entry

The entry for MIPS Ingenic JZ4780 DMA driver is not up to date anymore.
Zubair Lutfullah Kakakhel's email bounces and no maintenance is
provided.

Suggested-by: Paul Cercueil <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

Author: krzk

MAINTAINERS

@@ -8673,11 +8673,6 @@ F:	include/uapi/rdma/
 F:	samples/bpf/ibumad_kern.c
 F:	samples/bpf/ibumad_user.c
 
-INGENIC JZ4780 DMA Driver
-M:	Zubair Lutfullah Kakakhel <[email protected]>
-S:	Maintained
-F:	drivers/dma/dma-jz4780.c
-
 INGENIC JZ4780 NAND DRIVER
 M:	Harvey Hunt <[email protected]>
 L:	[email protected]