tools: move laptops dslm tool from Documentation

Move laptops dslm tool to tools/laptop/dslm and remove it from
Documentation Makefile. Update location information for this
tool. Create a new Makefile to build dslm. It can be built
from top level directory or from laptops directory:

Run make -C tools/laptop/dslm or cd tools/laptop/dslm; make

Acked-by: Jonathan Corbet <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

Documentation/Makefile

···
 subdir-y := blackfin \
-	laptops pcmcia
+	pcmcia

Documentation/laptops/00-INDEX

···
 00-INDEX
 	- This file
-Makefile
-	- Makefile for building dslm example program.
 asus-laptop.txt
 	- information on the Asus Laptop Extras driver.
 disk-shock-protection.txt
 	- information on hard disk shock protection.
-dslm.c
-	- Simple Disk Sleep Monitor program
 laptop-mode.txt
 	- how to conserve battery power using laptop-mode.
 sony-laptop.txt

Documentation/laptops/Makefile

···
-# List of programs to build
-hostprogs-y := dslm
-
-# Tell kbuild to always build the programs
-always := $(hostprogs-y)

Documentation/laptops/laptop-mode.txt

···
 ---------------
 
 Bartek Kania submitted this, it can be used to measure how much time your disk
-spends spun up/down.  See Documentation/laptops/dslm.c
+spends spun up/down.  See tools/laptop/dslm/dslm.c

tools/laptop/dslm/Makefile

···
+CC := $(CROSS_COMPILE)gcc
+CFLAGS := -I../../usr/include
+
+PROGS := dslm
+
+all: $(PROGS)
+
+clean:
+	rm -fr $(PROGS)