target/arm: Correct KVM & HVF dtb_compatible value

Linux kernel knows how to parse "arm,armv8", not "arm,arm-v8".

See arch/arm64/boot/dts/foundation-v8.dts:

  torvalds/linux@90556ca1ebdd

Cc: [email protected]
Fixes: 26861c7 ("target-arm: Add minimal KVM AArch64 support")
Fixes: 585df85 ("hvf: arm: Implement -cpu host")
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Message-id: [email protected]
Signed-off-by: Peter Maydell <[email protected]>
(cherry picked from commit a412575837b6a46584fba891e3706e87bd09a3e6)
(Mjt: context fix in target/arm/kvm.c)
Signed-off-by: Michael Tokarev <[email protected]>

Author: philmd

target/arm/hvf/hvf.c

@@ -878,7 +878,7 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
     hv_vcpu_exit_t *exit;
     int i;
 
-    ahcf->dtb_compatible = "arm,arm-v8";
+    ahcf->dtb_compatible = "arm,armv8";
     ahcf->features = (1ULL << ARM_FEATURE_V8) |
                      (1ULL << ARM_FEATURE_NEON) |
                      (1ULL << ARM_FEATURE_AARCH64) |

target/arm/kvm.c

@@ -305,7 +305,7 @@ static bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)
     }
 
     ahcf->target = init.target;
-    ahcf->dtb_compatible = "arm,arm-v8";
+    ahcf->dtb_compatible = "arm,armv8";
 
     err = read_sys_reg64(fdarray[2], &ahcf->isar.id_aa64pfr0,
                          ARM64_SYS_REG(3, 0, 0, 4, 0));