UPSTREAM: ARM: 9267/1: Define Armv8 registers in AArch32 state

AArch32 Instruction Set Attribute Register 6 (ID_ISAR6_EL1) and AArch32
Processor Feature Register 2 (ID_PFR2_EL1) identifies some new features
for the Armv8 architecture. This registers will be utilized to add
hwcaps for those cpu features.

These registers are marked as reserved for Armv7 and should be a RAZ.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Bug: 282663915
(cherry picked from commit 74c344e6)
Change-Id: I5545dbb3d22424ef130c0f95e92ee31a9e7de9be
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>