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 <linux@dominikbrodowski.net>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/pcmcia/.gitignore

@@ -0,0 +1 @@
+crc32hash

tools/pcmcia/Makefile

@@ -0,0 +1,9 @@
+CC := $(CROSS_COMPILE)gcc
+CFLAGS := -I../../usr/include
+
+PROGS := crc32hash
+
+all: $(PROGS)
+
+clean:
+	rm -fr $(PROGS)

tools/pcmcia/crc32hash.c

@@ -0,0 +1,32 @@
+/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
+/* Usage example:
+$ ./crc32hash "Dual Speed"
+*/
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+static unsigned int crc32(unsigned char const *p, unsigned int len)
+{
+	int i;
+	unsigned int crc = 0;
+	while (len--) {
+		crc ^= *p++;
+		for (i = 0; i < 8; i++)
+			crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
+	}
+	return crc;
+}
+
+int main(int argc, char **argv) {
+	unsigned int result;
+	if (argc != 2) {
+		printf("no string passed as argument\n");
+		return -1;
+	}
+	result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
+	printf("0x%x\n", result);
+	return 0;
+}