[][Remove legacy pdma v1 support in netsys2.0]

[Description]
Remove legacy pdma v1 support in netsys2.0
1. only left flag : CONFIG_MEDIATEK_NETSYS_V2
2. only left caps : MTK_NETSYS_V2

[Release-log]
N/A

Change-Id: I850ae3ff4b60cbda03c06387f23430b32604d5b8
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4596413
4 files changed