Move arm specific man page to man4.arm subfolder

Reported by:	ian

share/man/man4/Makefile

@@ -70,9 +70,6 @@ MAN=	aac.4 \
 	audit.4 \
 	auditpipe.4 \
 	aue.4 \
-	aw_gpio.4 \
-	aw_mmc.4 \
-	aw_rtc.4 \
 	axe.4 \
 	axge.4 \
 	bce.4 \

share/man/man4/man4.arm/Makefile

@@ -2,7 +2,10 @@
 
 PACKAGE=runtime-manuals
 
-MAN=	cgem.4 \
+MAN=	aw_gpio.4 \
+	aw_mmc.4 \
+	aw_rtc.4 \
+	cgem.4 \
 	devcfg.4 \
 	mge.4 \
 	npe.4 \