JZ2440笔记：rtc驱动

在common-smdk.c里smdk_devs添加&s3c_device_rtc

重新编译uImage，测试：

# ls /dev/rtc* -l
crw-rw----    1 0        0        254,   0 May  6 21:58 /dev/rtc0
# date
Tue May  6 21:59:56 UTC 1975
# date 05311448202420
date: invalid date '05311448202420'
# date 053114482024.40
Fri May 31 14:48:40 UTC 2024
# hwclock -w
# reboot

# date
Fri May 31 14:49:55 UTC 2024
# date
Fri May 31 14:50:02 UTC 2024
# date
Fri May 31 14:50:06 UTC 2024
#