all devices behind rtciobrg needs a special way to access. currently they
are using a platform-specific API.
this patch moves to REGMAP, then clients can use regmap APIs to read/write.
for the moment, old APIs are still kept, once all clients move to regmap,
old APIs will be dropped.

this patch also does minor clean for comments, authors statement.
Signed-off-by: NGuo Zeng <Guo.Zeng@csr.com>
Signed-off-by: NBarry Song <Baohua.Song@csr.com>

The module is a bridge between the RTC clock domain and the CPU interface
clock domain. ARM access the register of SYSRTC, GPSRTC and PWRC through
this module.
Signed-off-by: NZhiwu Song <zhiwu.song@csr.com>
Signed-off-by: NBarry Song <Baohua.Song@csr.com>
Reviewed-by: NJamie Iles <jamie@jamieiles.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>