PcAtChipsetPkg: RTC: Modification of "read only" bit VRT considered harmful.

Modification of "read only" bit VRT in register D considered harmful.
Peculiar RTC implementations have VRT bit writable.
Writing 0 to VRT bit produce a bunch of hardware
events. Some chips are slow enough and failure the check for validity.
ASSERT triggered.

Attached patch tries to fix the problem.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Nikolai Saoukh <nikolai.sao...@gmail.com>

Attachment: PcRtc.c.patch
Description: Binary data

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