PNP: Compile all pnp built-in stuff in one module namespace

This is cleanup mostly, nothing urgent.
I came up with it when looking at dynamic debug which can
enable pr_debug messages at runtime or boot param
for a specific module.

Advantages:
  - Any pnp code can make use of the moduleparam.h interface, the modules
    will show up as pnp.param.
  - Passing pnp.ddebug as kernel boot param will enable all pnp debug messages
    with my previous patch and CONFIG_DYNAMIC_DEBUG enabled.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/pnp/Makefile

@@ -2,11 +2,13 @@
 # Makefile for the Linux Plug-and-Play Support.
 #
 
-obj-y		:= core.o card.o driver.o resource.o manager.o support.o interface.o quirks.o
+obj-y		:= pnp.o
+
+pnp-y		:= core.o card.o driver.o resource.o manager.o support.o interface.o quirks.o
 
 obj-$(CONFIG_PNPACPI)		+= pnpacpi/
 obj-$(CONFIG_PNPBIOS)		+= pnpbios/
 obj-$(CONFIG_ISAPNP)		+= isapnp/
 
 # pnp_system_init goes after pnpacpi/pnpbios init
-obj-y				+= system.o
+pnp-y				+= system.o

drivers/pnp/isapnp/Makefile

 #
 # Makefile for the kernel ISAPNP driver.
 #
+obj-y			+= pnp.o
+pnp-y			:= core.o compat.o
 
-isapnp-proc-$(CONFIG_PROC_FS) = proc.o
-
-obj-y := core.o compat.o $(isapnp-proc-y)
+pnp-$(CONFIG_PROC_FS)	+= proc.o

drivers/pnp/pnpacpi/Makefile

 #
 # Makefile for the kernel PNPACPI driver.
 #
+obj-y += pnp.o
 
-obj-y := core.o rsparser.o
+pnp-y := core.o rsparser.o

drivers/pnp/pnpbios/Makefile

 #
 # Makefile for the kernel PNPBIOS driver.
 #
+obj-y := pnp.o
 
-pnpbios-proc-$(CONFIG_PNPBIOS_PROC_FS) = proc.o
+pnp-y := core.o bioscalls.o rsparser.o
 
-obj-y := core.o bioscalls.o rsparser.o $(pnpbios-proc-y)
+pnp-$(CONFIG_PNPBIOS_PROC_FS) += proc.o