x86: ignore stepping for APL30 errata

The issue is present in all apollolake cpus and it doesn't look like
there'll be a fix in the future.

See
https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/pentium-celeron-n-series-j-series-datasheet-spec-update.pdf

MFC after: 1 week
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D37621

(cherry picked from commit 122405c9034b624dd6771d578ef2467aa96cc145)

x86: Remove redundant parentheses

Reported by: avg
Sponsored by: Beckhoff Automation GmbH & Co. KG
MFC after: 1 week
MFC-With: b223c1f1a0ac ("x86: Add another cpuid for Apollo Lake errata APL30")

(cherry picked from commit 821b850a3bb73a78eef97ea22d1dc6ea82195b65)

x86: Add another cpuid for Apollo Lake errata APL30

Sponsored by: Beckhoff Automation GmbH & Co. KG
MFC after: 1 week

(cherry picked from commit b223c1f1a0ac83a3bd1475add9b794bad1749b2f)