grow alpha and hppa media to accomodate some recent growth

src/etc/etc.alpha/disktab

@@ -1,9 +1,9 @@
-#	$OpenBSD: disktab,v 1.23 2015/08/28 21:20:08 deraadt Exp $
+#	$OpenBSD: disktab,v 1.24 2018/09/20 15:19:36 deraadt Exp $
 
 fakeramdisk:\
-	:dt=rdroot:se#512:nt#1:ns#32:nc#180:\
-	:pa#5760:oa#0:ba#8192:fa#4096:ta=4.2BSD:\
-	:pc#5760:oc#0:
+	:dt=rdroot:se#512:nt#1:ns#32:nc#190:\
+	:pa#6080:oa#0:ba#8192:fa#4096:ta=4.2BSD:\
+	:pc#6080:oc#0:
 
 floppy|floppy3|3in|3.5in High Density Floppy:\
 	:dt=floppy:se#512:nt#2:ns#18:nc#80:\

src/etc/etc.hppa/disktab

@@ -1,6 +1,6 @@
-#	$OpenBSD: disktab,v 1.10 2016/12/30 22:26:29 deraadt Exp $
+#	$OpenBSD: disktab,v 1.11 2018/09/20 15:19:38 deraadt Exp $
 
 rdroot|ramdiskroot|RAM-disk root FS image:\
-	:dt=rdroot:se#512:nc#18:nt#2:ns#200:\
-	:ta=4.2BSD:oa#0:pa#7200:fa#1024:ba#8192:\
-	:ob#0:pb#0:oc#0:pc#7200:
+	:dt=rdroot:se#512:nc#18:nt#2:ns#220:\
+	:ta=4.2BSD:oa#0:pa#7920:fa#1024:ba#8192:\
+	:ob#0:pb#0:oc#0:pc#7920: