use jtag_rclk 500 to avoid proliferation of target scripts

git-svn-id: svn://svn.berlios.de/openocd/trunk@1574 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/target/target/lpc2148.cfg

+# Use RCLK. If RCLK is not available fall back to 500kHz. 
+# 
+# Depending on cabling you might be able to eek this up to 2000kHz.
+jtag_rclk 500
+
 if { [info exists CHIPNAME] } {	
    set _CHIPNAME $CHIPNAME
 } else {

src/target/target/lpc2148_2mhz.cfg

-# 2MHz
-jtag_khz 2000
-script target/lpc2148.cfg
-

src/target/target/lpc2148_rclk.cfg

-# RCLK
-jtag_khz 0
-script target/lpc2148.cfg
-