tools/sdiodevs2h.awk: introduce palias

Some of the defined names are not the direct 1:1 mapping with vendor
and device names used by Linux device drivers.
Introduce a p(roduct)alias so we can map the one device entry I came
across without much extra hassle and generate a name device drivers
know about:
palias BROADCOM_CYPRESS_43439  CYPRESS_43439

Sponsored by:	The FreeBSD Foundation
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D46455

(cherry picked from commit b4ef1b1be753952a4aafa505817164624f712c37)

sys/tools/sdiodevs2h.awk

@@ -149,6 +149,18 @@ function product(hfile)
 		printf("\n") > hfile
 }
 
+function palias(hfile)
+{
+	nproducts++
+
+	products[nproducts, 1] = $2;		# vendor name
+	products[nproducts, 2] = $3;		# product id
+	products[nproducts, 3] = $4;		# id
+	if (hfile)
+		printf("#define\tSDIO_DEVICE_ID_%s\tSDIO_DEVICE_ID_%s\n", \
+		  $2, $3) > hfile
+}
+
 function dump_dfile(dfile)
 {
 	printf("\n") > dfile
@@ -243,6 +255,10 @@ while ((getline < srcfile) > 0) {
 		product(hfile)
 		continue
 	}
+	if ($1 == "palias") {
+		palias(hfile)
+		continue
+	}
 	if ($0 == "")
 		blanklines++
 	if (hfile)