arm64: cpuidle: Move ACPI specific code into drivers/acpi/arm64/

The ACPI cpuidle LPI FFH code can be moved out of arm64 arch code as
it just uses SMCCC. Move all the ACPI cpuidle LPI FFH code into
drivers/acpi/arm64/cpuidle.c
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://lore.kernel.org/r/20240605131458.3341095-3-sudeep.holla@arm.comSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/Makefile

@@ -46,7 +46,6 @@ obj-$(CONFIG_PERF_EVENTS)		+= perf_regs.o perf_callchain.o
 obj-$(CONFIG_HARDLOCKUP_DETECTOR_PERF)	+= watchdog_hld.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)	+= hw_breakpoint.o
 obj-$(CONFIG_CPU_PM)			+= sleep.o suspend.o
-obj-$(CONFIG_CPU_IDLE)			+= cpuidle.o
 obj-$(CONFIG_JUMP_LABEL)		+= jump_label.o
 obj-$(CONFIG_KGDB)			+= kgdb.o
 obj-$(CONFIG_EFI)			+= efi.o efi-rt-wrapper.o

drivers/acpi/arm64/Makefile

@@ -3,6 +3,7 @@ obj-$(CONFIG_ACPI_AGDI) 	+= agdi.o
 obj-$(CONFIG_ACPI_APMT) 	+= apmt.o
 obj-$(CONFIG_ACPI_GTDT) 	+= gtdt.o
 obj-$(CONFIG_ACPI_IORT) 	+= iort.o
+obj-$(CONFIG_ACPI_PROCESSOR_IDLE) += cpuidle.o
 obj-$(CONFIG_ARM_AMBA)		+= amba.o
 obj-y				+= dma.o init.o
 obj-y				+= thermal_cpufreq.o

arch/arm64/kernel/cpuidle.c → drivers/acpi/arm64/cpuidle.c

@@ -10,9 +10,6 @@
 #include <linux/cpuidle.h>
 #include <linux/cpu_pm.h>
 #include <linux/psci.h>
-
-#ifdef CONFIG_ACPI_PROCESSOR_IDLE
-
 #include <acpi/processor.h>
 
 #define ARM64_LPI_IS_RETENTION_STATE(arch_flags) (!(arch_flags))
@@ -71,4 +68,3 @@ __cpuidle int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
 		return CPU_PM_CPU_IDLE_ENTER_PARAM_RCU(psci_cpu_suspend_enter,
 					     lpi->index, state);
 }
-#endif