armsr: 6.12: add new KConfigs and refresh

armsr: 6.12: add new KConfigs and refresh

This includes both new additions to 6.12
and an attempted "refresh" of the config
to remove duplicates from target/generic/config-6.12.

(The OpenWrt kernel_makeoldconfig does not
work well with the armv8 subtarget for reasons
I am yet to determine, so that file has been
pruned manually)

Most new options are in armv8, where the
KConfig relates to a platform that will likely
be armsr compatible (like the i.MX91/93/95),
it has been enabled.

Signed-off-by: Mathew McBride <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18849
Signed-off-by: Hauke Mehrtens <[email protected]>