dax/hmem: Move HMAT and Soft reservation probe initcall level

In preparation for moving more filtering of "hmem" ranges into the
dax_hmem.ko module, update the initcall levels. HMAT range registration
moves to subsys_initcall() to be done before Soft Reservation probing,
and Soft Reservation probing is moved to device_initcall() to be done
before dax_hmem.ko initialization if it is built-in.

Tested-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167602001107.1924368.11562316181038595611.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/acpi/numa/hmat.c

@@ -869,4 +869,4 @@ static __init int hmat_init(void)
 	acpi_put_table(tbl);
 	return 0;
 }
-device_initcall(hmat_init);
+subsys_initcall(hmat_init);

drivers/dax/hmem/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_DEV_DAX_HMEM) += dax_hmem.o
+# device_hmem.o deliberately precedes dax_hmem.o for initcall ordering
 obj-$(CONFIG_DEV_DAX_HMEM_DEVICES) += device_hmem.o
+obj-$(CONFIG_DEV_DAX_HMEM) += dax_hmem.o
 
 device_hmem-y := device.o
 dax_hmem-y := hmem.o

drivers/dax/hmem/device.c

@@ -104,4 +104,4 @@ static __init int hmem_init(void)
  * As this is a fallback for address ranges unclaimed by the ACPI HMAT
  * parsing it must be at an initcall level greater than hmat_init().
  */
-late_initcall(hmem_init);
+device_initcall(hmem_init);