powerpc/64: Set DSCR default initially from SPR
Take the DSCR value set by firmware as the dscr_default value, rather than zero. POWER9 recommends DSCR default to a non-zero value. Signed-off-by: NFrom: Nicholas Piggin <npiggin@gmail.com> [mpe: Make record_spr_defaults() __init] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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