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Revert "riscv: enable allwinner RTC"

Description

Revert "riscv: enable allwinner RTC"

It caused a regression on A10/A20 platforms. Revert until the proper fix
can be determined.

This reverts commit 9ddd516b886218af809dbf40eeda1ed388e2879c.

PR: 285054
Reported by: mmel