powerpc/powernv/idle: Exclude mfspr on HID1, 4, 5 on P9 and above

POWER9 onwards the support for the registers HID1, HID4, HID5 has been
receded.
Although mfspr on the above registers worked in Power9, In Power10
simulator is unrecognized. Moving their assignment under the
check for machines lower than Power9

Signed-off-by: Pratik Rajesh Sampat <[email protected]>
Reviewed-by: Gautham R. Shenoy <[email protected]>
Reviewed-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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