[][Add flashes' fixed partitions to dts]

[Description]
Add flashes' fixed partitions to dts:
1. Move SPIM-NOR's & SPIM-NAND's fixed partitions to dts.
2. wbsys is enabled by default now. Move it back to dtsi.

[Release-log]
N/A

Change-Id: I173e0e4ed3c74081bc2e6d00ab1a039fcb56e6c7
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5044106
13 files changed