Change all '$(...)' variable references into '${...}'

which makes the environment compatible with the hush shell.
WARNING: Support for the old '$(...)' syntax will be
discontinued in a later version.

include/configs/R360MPI.h

@@ -63,8 +63,8 @@
 #undef	CONFIG_BOOTARGS
 #define CONFIG_BOOTCOMMAND							\
 	"bootp; " 								\
-	"setenv bootargs root=/dev/nfs rw nfsroot=$(serverip):$(rootpath) " 	\
-	"ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):$(hostname)::off; " 	\
+	"setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${rootpath} " 	\
+	"ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off; " 	\
 	"bootm"
 
 #undef	CONFIG_SCC1_ENET