tools: move pcmcia crc32hash tool from Documentation

Move pcmcia crc32hash tool from Documentation to tools/pcmcia and
remove it from Documentation Makefile. Update location information
for this tool. Create a new Makefile to build pcmcia. It can be built
from top level directory or from pcmcia directory:

Run make -C tools/pcmcia or cd tools/pcmcia; make

Acked-by: Dominik Brodowski <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Acked-by: Jonathan Corbet <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

Documentation/Makefile

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

Documentation/pcmcia/Makefile

···
-# List of programs to build
-hostprogs-y := crc32hash
-
-# Tell kbuild to always build the programs
-always := $(hostprogs-y)
-
-HOSTCFLAGS_crc32hash.o += -I$(objtree)/usr/include

Documentation/pcmcia/devicetable.txt

···
 The hex value after "pa" is the hash of product ID string 1, after "pb" for
 string 2 and so on.
 
-Alternatively, you can use crc32hash (see Documentation/pcmcia/crc32hash.c)
+Alternatively, you can use crc32hash (see tools/pcmcia/crc32hash.c)
 to determine the crc32 hash.  Simply pass the string you want to evaluate
 as argument to this program, e.g.:
-$ ./crc32hash "Dual Speed"
+$ tools/pcmcia/crc32hash "Dual Speed"

MAINTAINERS

···
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia.git
 S:	Maintained
 F:	Documentation/pcmcia/
+F:	tools/pcmcia/
 F:	drivers/pcmcia/
 F:	include/pcmcia/
 

tools/pcmcia/Makefile

···
+CC := $(CROSS_COMPILE)gcc
+CFLAGS := -I../../usr/include
+
+PROGS := crc32hash
+
+all: $(PROGS)
+
+clean:
+	rm -fr $(PROGS)