surface_acpi: Integrate dGPU hot-plug system

- Integrate dGPU hot-plug system driver into SAM driver collection.

- Fix MODULE_ALIAS definitions for auto-loading the SID battery/ac
  drivers.

Author: qzed

drivers/platform/x86/surface_sam/Kconfig

@@ -91,6 +91,17 @@ config SURFACE_SAM_DTX
 
 	  If you are not sure, say M here.
 
+config SURFACE_SAM_HPS
+	tristate "Surface dGPU Hot-Plug System (dGPU-HPS) Driver"
+	depends on SURFACE_SAM_SSH
+	depends on SURFACE_SAM_SAN
+	default m
+	---help---
+	  Driver to properly handle hot-plugging and explicit power-on/power-off
+	  of the discrete GPU (dGPU) on the Surface Book 2.
+
+	  If you are not sure, say M here.
+
 config SURFACE_SAM_SID
 	tristate "Surface Platform Integration Driver"
 	depends on SURFACE_SAM_SSH

drivers/platform/x86/surface_sam/Makefile

@@ -1,6 +1,7 @@
 obj-$(CONFIG_SURFACE_SAM_SSH)		+= surface_sam_ssh.o
 obj-$(CONFIG_SURFACE_SAM_SAN)		+= surface_sam_san.o
 obj-$(CONFIG_SURFACE_SAM_DTX)		+= surface_sam_dtx.o
+obj-$(CONFIG_SURFACE_SAM_HPS)		+= surface_sam_hps.o
 obj-$(CONFIG_SURFACE_SAM_VHF)		+= surface_sam_vhf.o
 obj-$(CONFIG_SURFACE_SAM_SID)		+= surface_sam_sid.o
 obj-$(CONFIG_SURFACE_SAM_SID_GPELID)	+= surface_sam_sid_gpelid.o