x86/ACPI: CPPC: Add missing include

Some minimial kernel configurations will fail with -Werror=implicit-function-declaration
due to a missing header include.

Add that header.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20250211203314.762755-1-superm1@kernel.org
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello 2025-02-11 14:32:52 -06:00 • committed by Rafael J. Wysocki
commit c9e6f7fb1c