hvf: arm: Emulate ICC_RPR_EL1 accesses properly

hvf: arm: Emulate ICC_RPR_EL1 accesses properly

Commit a2260983c655 ("hvf: arm: Add support for GICv3") added GICv3 support
by implementing emulation for a few system registers. ICC_RPR_EL1 was
defined but not plugged in the sysreg handlers (for no good reason).

Fix it.

Fixes: a2260983c655 ("hvf: arm: Add support for GICv3")
Signed-off-by: Zenghui Yu <zenghui.yu@linux.dev>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250714160139.10404-3-zenghui.yu@linux.dev
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit e6da704b711d5d731e4d933ad56cbbc25ee0a825)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>