ACPI / CPPC: Use h/w reduced version of the PCCT structure

CPPC is enabled only on platforms which support the h/w reduced
ACPI specification, so use the h/w reduced version of the PCCT
consistently when deferencing PCCT contents.

Fixes: 337aadff (ACPI: Introduce CPU performance controls using CPPC)
Signed-off-by: NAshwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/cppc_acpi.c

@@ -304,7 +304,7 @@ EXPORT_SYMBOL_GPL(acpi_get_psd_map);
 
 static int register_pcc_channel(unsigned pcc_subspace_idx)
 {
-	struct acpi_pcct_subspace *cppc_ss;
+	struct acpi_pcct_hw_reduced *cppc_ss;
 	unsigned int len;
 
 	if (pcc_subspace_idx >= 0) {