Support for RTC DS1307

Hi there,

please find the attached patch adding support for a new I2C RTC DS1307 to u-boot _and_ ppcboot-2.0.0.

Please comment about how I handle the year.

Thanks a million,

Steven

CHANGELOG:
==========
* Added DS1307 RTC driver
Patch by Steven Scholz, 4 Feb 2003

README:
=======

@@ -624,6 +624,7 @@
                 CONFIG_RTC_MPC8xx       - use internal RTC of MPC8xx
                 CONFIG_RTC_PCF8563      - use Philips PCF8563 RTC
                 CONFIG_RTC_MC146818     - use MC146818 RTC
+               CONFIG_RTC_DS1307       - use Maxim, Inc. DS1307 RTC
                 CONFIG_RTC_DS1337       - use Maxim, Inc. DS1337 RTC
 
  - Timestamp Support:

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