target/arm: Put all PAC keys into a structure

This allows us to use a single syscall to initialize them all.

Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 72e43b5..3de792a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9775,23 +9775,23 @@
                         return -TARGET_EINVAL;
                     }
                     if (arg2 & TARGET_PR_PAC_APIAKEY) {
-                        ret |= qemu_guest_getrandom(&env->apia_key,
+                        ret |= qemu_guest_getrandom(&env->keys.apia,
                                                     sizeof(ARMPACKey), &err);
                     }
                     if (arg2 & TARGET_PR_PAC_APIBKEY) {
-                        ret |= qemu_guest_getrandom(&env->apib_key,
+                        ret |= qemu_guest_getrandom(&env->keys.apib,
                                                     sizeof(ARMPACKey), &err);
                     }
                     if (arg2 & TARGET_PR_PAC_APDAKEY) {
-                        ret |= qemu_guest_getrandom(&env->apda_key,
+                        ret |= qemu_guest_getrandom(&env->keys.apda,
                                                     sizeof(ARMPACKey), &err);
                     }
                     if (arg2 & TARGET_PR_PAC_APDBKEY) {
-                        ret |= qemu_guest_getrandom(&env->apdb_key,
+                        ret |= qemu_guest_getrandom(&env->keys.apdb,
                                                     sizeof(ARMPACKey), &err);
                     }
                     if (arg2 & TARGET_PR_PAC_APGAKEY) {
-                        ret |= qemu_guest_getrandom(&env->apga_key,
+                        ret |= qemu_guest_getrandom(&env->keys.apga,
                                                     sizeof(ARMPACKey), &err);
                     }
                     if (ret != 0) {