riscv: abstract out CSR names for supervisor vs machine mode

Many of the privileged CSRs exist in a supervisor and machine version
that are used very similarly.  Provide versions of the CSR names and
fields that map to either the S-mode or M-mode variant depending on
a new CONFIG_RISCV_M_MODE kconfig symbol.

Contains contributions from Damien Le Moal <[email protected]>
and Paul Walmsley <[email protected]>.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Thomas Gleixner <[email protected]> # for drivers/clocksource, drivers/irqchip
[[email protected]: updated to apply]
Signed-off-by: Paul Walmsley <[email protected]>

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