UPSTREAM: ARM: perf: Allow the use of the PMUv3 driver on 32bit ARM

The only thing stopping the PMUv3 driver from compiling on 32bit
is the lack of defined system registers names and the handful of
required helpers.

This is easily solved by providing the sysreg accessors and updating
the Kconfig entry.

Change-Id: I3f7f46feaeac69bb7d20c86b013e4a3091fb4bce
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Co-developed-by: Zaid Al-Bassam <zalbassam@google.com>
Signed-off-by: Zaid Al-Bassam <zalbassam@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230317195027.3746949-8-zalbassam@google.com


Signed-off-by: Will Deacon <will@kernel.org>
(cherry picked from commit 009d6dc8)
Signed-off-by: Danesh Petigara <danesh.petigara@broadcom.com>