Add support for the X1830 and fix bugs for X1000 v7.

[åçæ (Zhou Yanjie)]

v6->v7:
1.Update commit message of [2/6].
2.Adjust includes in [4/6], add blank line as Paul Cercueil's suggest,
  and Move "*cgu" into x1830_cgu_init() as a local variable.
3.Update commit message of [6/6].