ACPI / PPTT: fix build when CONFIG_ACPI_PPTT is not enabled

Though CONFIG_ACPI_PPTT is selected by platforms and nor user visible,
it may be useful to support the build with CONFIG_ACPI_PPTT disabled.

This patch adds the missing dummy/boiler plate implementation to fix
the build.
Acked-by: N"Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

include/linux/acpi.h

@@ -1297,8 +1297,23 @@ static inline int lpit_read_residency_count_address(u64 *address)
 }
 #endif
 
+#ifdef CONFIG_ACPI_PPTT
 int find_acpi_cpu_topology(unsigned int cpu, int level);
 int find_acpi_cpu_topology_package(unsigned int cpu);
 int find_acpi_cpu_cache_topology(unsigned int cpu, int level);
+#else
+static inline int find_acpi_cpu_topology(unsigned int cpu, int level)
+{
+	return -EINVAL;
+}
+static inline int find_acpi_cpu_topology_package(unsigned int cpu)
+{
+	return -EINVAL;
+}
+static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
+{
+	return -EINVAL;
+}
+#endif
 
 #endif	/*_LINUX_ACPI_H*/

include/linux/cacheinfo.h

@@ -98,7 +98,7 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
 int init_cache_level(unsigned int cpu);
 int populate_cache_leaves(unsigned int cpu);
 int cache_setup_acpi(unsigned int cpu);
-#ifndef CONFIG_ACPI
+#ifndef CONFIG_ACPI_PPTT
 /*
  * acpi_find_last_cache_level is only called on ACPI enabled
  * platforms using the PPTT for topology. This means that if