Reset controller changes for v4.11

- fix ti_syscon reset_status reporting
- add Hisilicon Hi3660 reset controller driver
- add ZTE ZX2967 reset controller driver
- add LD11 SD-reset block to uniphier reset controller driver
- typo and correctness fixes
- make reset_control_get variants return NULL instead of an
  error for optional, not specified resets and have the other
  reset API functions silently ignore rstc == NULL parameters.
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