hvf: arm: Fix hvf_sysreg_read_cp() call

hvf: arm: Fix hvf_sysreg_read_cp() call

Changed val from uint64_t to a pointer to uint64_t in hvf_sysreg_read,
but didn't change its usage in hvf_sysreg_read_cp call.

Fixes: e9e640148c ("hvf: arm: Raise an exception for sysreg by default")
Reported-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240802-hvf-v1-1-e2c0292037e5@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>