Extract register descriptions from Allwinner user manual to SVD.
Tested with:
- t113-s3_user_manual_v1.1.pdf (sha256sum: 4f83ef8c5d95cd643e2c98ed12d7bcd7a44711b0d8dcd5c7353479e0f84e6870)
- H616_User_Manual_V1.0_cleaned.pdf (sha256sum: 4ca95572826a1d98b687ae74c1bb2f62597b70f5aafa20d698c4ed6792b20e05)
- Allwinner_H6_V200_User_Manual_V1.1.pdf (sha256sum: 338f2b96dee05692f77a541076bcf2de3e7ce9f5d103db467643ca760fc7356c)
- Allwinner_H5_Manual_v1.0.pdf (sha256sum: 00ba91b3aa77dec90dca187d9d6a2d5f1d16634979b0d1cdeda3655e0977ef19)
- Allwinner_H3_Datasheet_V1.2.pdf (sha256sum: 95447916442c88f791226fcc6062adac7d62597138413637efa06a7e8c877d2b)
- Allwinner_V3s_Datasheet_V1.0.pdf (sha256sum: 2ffa38f7ba0c5e0c7d48da62ebf403cdc937e0029bf9a054babcffc899744080)
- Allwinner_A64_User_Manual_V1.1.pdf (sha256sum: 47cf65c7af3f030b4ea695d682081ab4eab3e1237bf32e9ec15c05e934ed9e4c)
- Allwinner_R40_User_Manual_V1.0.pdf (sha256sum: f77b50859d0a8125c3622c83ad63a209a2ffa32cc84f6f1a624617c39270ef2e)
- D1_User_Manual_V0.1_Draft_Version.pdf (sha256sum: d4d5c38bbdbee7d2925416dae993b7c0ebcd44eeffa95be89497a3d9374a26f9)
- D1-H_User_Manual_V1.0.pdf (sha256sum: 5c304dea5ef998f29d499227d1abb451649e4e5ee29950d002959c6541fc1b91)
- D1-H_User Manual_V1.2.pdf (sha256sum: f5735f0e18dd5c831c1cb4030c4db99f99a1711e044069209a6253f80e74b4af)
- D1s_User_Manual_V1.0.pdf (sha256sum: 085435d9aaae1f85c4da98d4c3e227a4140490a0ca0b06c599be2fc8ee03e002)