rtc: cmos: Revert "rtc: Fix the AltCentury value on AMD/Hygon platform"

rtc: cmos: Revert "rtc: Fix the AltCentury value on AMD/Hygon platform"

There are multiple reports of this patch breaking RTC time setting for AMD
platforms.

This reverts commit 9bd8730e9f2fbb67dd58565f2e0d528e4bd7ae1b.

Cc: Jinke Fan <fanjinke@hygon.cn>
Link: https://lore.kernel.org/r/CABXGCsMLob0DC25JS8wwAYydnDoHBSoMh2_YLPfqm3TTvDE-Zw@mail.gmail.com
Fixes: 9bd8730e9f2f ("rtc: Fix the AltCentury value on AMD/Hygon platform")
Link: https://lore.kernel.org/r/20200104043110.707810-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>