[L] Change in coreboot[main]: soc/mediatek/mt8196: Add DDP driver

[Yidi Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Jarried Lin, Nancy Lin, Paul Menzel, Yu-Ping Wu.

Yidi Lin has posted comments on this change by Jarried Lin. ( https://review.coreboot.org/c/coreboot/+/85950?usp=email )

Change subject: soc/mediatek/mt8196: Add DDP driver
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Patch Set 3:

(3 comments)

File src/soc/mediatek/common/display.c:

https://review.coreboot.org/c/coreboot/+/85950/comment/7a8cdb45_80adb8f1?usp... :
PS2, Line 46: __weak int mtk_edp_enable(void)
> This can't merged into mtk_edp_init. […]

Why do the past platforms (mt8195/mt8188) not follow this flow ?

File src/soc/mediatek/mt8196/ddp.c:

https://review.coreboot.org/c/coreboot/+/85950/comment/548af839_ac551f50?usp... :
PS3, Line 267: setbits32(&exdma2_reg->rdma_burst_ctl, BIT(28));
             : 	clrbits32(&exdma2_reg->rdma_burst_ctl, BIT(30));
             : 	setbits32(&exdma2_reg->rdma_burst_ctl, BIT(31));
             : 	setbits32(&exdma2_reg->dummy, BIT(2));
             : 	setbits32(&exdma2_reg->dummy, BIT(3));
             : 	setbits32(&exdma2_reg->datapath_con, BIT(0));
             : 	setbits32(&exdma2_reg->datapath_con, BIT(24));
             : 	setbits32(&exdma2_reg->datapath_con, BIT(25));
             : 	clrbits32(&exdma2_reg->ovl_mout, BIT(0));
             : 	setbits32(&exdma2_reg->ovl_mout, BIT(1));
can we use `clrsetbits32` for those settings ?

File src/soc/mediatek/mt8196/include/soc/addressmap.h:

https://review.coreboot.org/c/coreboot/+/85950/comment/657050b9_e6f0f9a7?usp... :
PS3, Line 198: MMSYS_MUTEX_BASE	= IO_PHYS + 0x22020000,
move to line 190