drm/amdgpu: change the reference clock for raven/raven2

Due to switch to golden tsc register to get clock counter for raven/ raven2.
Chang the reference clock from 25MHZ to 100MHZ.
Suggested-by: Nshanshengwang <shansheng.wang@amd.com>
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NJesse Zhang <jesse.zhang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -301,11 +301,10 @@ static u32 soc15_get_xclk(struct amdgpu_device *adev)
 	u32 reference_clock = adev->clock.spll.reference_freq;
 
 	if (adev->ip_versions[MP1_HWIP][0] == IP_VERSION(12, 0, 0) ||
-	    adev->ip_versions[MP1_HWIP][0] == IP_VERSION(12, 0, 1))
-		return 10000;
-	if (adev->ip_versions[MP1_HWIP][0] == IP_VERSION(10, 0, 0) ||
+	    adev->ip_versions[MP1_HWIP][0] == IP_VERSION(12, 0, 1) ||
+	    adev->ip_versions[MP1_HWIP][0] == IP_VERSION(10, 0, 0) ||
 	    adev->ip_versions[MP1_HWIP][0] == IP_VERSION(10, 0, 1))
-		return reference_clock / 4;
+		return 10000;
 
 	return reference_clock;
 }