libc: add support for localtime in date command
libc: add support for localtime in date command

Date command did not support localtime (LIBC_LOCALTIME).
This patch gives support for 3 more parameters in date command namely:
Day of Week			[Sunday = Sun, Monday = Mon, and so on...]
Day of Year			[0,365]
Daylight savings time(DST) flag	[positive: DST in effect, 0: DST not in effect, negative: information not availabe]
The parameters are updated based on the RTC support for Localtime.

Signed-off-by: Vidisha Thapa <3d8bcdb46ae40344d12a5a0255e34cf386c7657a@samsung.com>

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