hyperv: Fix usage of wrong time ref MSR on x86

When 668afda ("arm64: hyperv: Fix build breakage for non-ARM64
architectures") was forward ported to 6.18, the similarly named
HV_REGISTER_TIME_REF_COUNT was used instead of HV_MSR_TIME_REF_COUNT.
The HV_REGISTER_TIME_REF_COUNT register is ARM64-specific, so when it
was used on x86, it produced garbage. This entirely breaks timekeeping
on guests without a TSC. Use HV_MSR_TIME_REF_COUNT instead, which
results to the correct MSR for the current arch.

Fixes: 668afda ("arm64: hyperv: Fix build breakage for non-ARM64 architectures")
Signed-off-by: Mitchell Levy <levymitchell0@gmail.com>

Author: chessturo

drivers/clocksource/hyperv_timer.c

@@ -393,9 +393,9 @@ static __always_inline u64 read_hv_clock_msr(void)
 	 * it doesn't need the GHCB path.
 	 */
 #ifdef CONFIG_ARM64
-	return hv_get_msr(HV_REGISTER_TIME_REF_COUNT);
+	return hv_get_msr(HV_MSR_TIME_REF_COUNT);
 #else
-	return hv_raw_get_msr(HV_REGISTER_TIME_REF_COUNT);
+	return hv_raw_get_msr(HV_MSR_TIME_REF_COUNT);
 #endif
 }