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rtc: bbnsm: Add the bbnsm rtc support

Steve Best requested to merge sfbest/centos-stream-9:2182332 into main

Description: NXP BBNSM (Battery-Backed Non-Secure Module) serves as non-volatile logic and storage for the system. it provides some similar functions like RTC and ON/OFF support as previous SNVS module found on legacy i.MX SoCs. The BBNSM is replacement of previous SNVS module, and more likely it will be used on all the future i.MX SoC or other SoCs from NXP.

This patchset add the basic support for BBNSM that is found on i.MX93.

Bugzilla: http://bugzilla.redhat.com/2182332

Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=51641597

Tested: Did sanity boot testing on (nxp-imx8mquad-01.edge1) system.

Signed-off-by: Steve Best sbest@redhat.com

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