target config files: Fix whitespace issues.

Drop useless double-space occurences, drop trailing whitespace, and fix
some other minor whitespace-related issues.

Change-Id: I6b4c515492e2ee94dc25ef1fe4f51015a4bba8b5
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/137
Tested-by: jenkins

tcl/target/atmega128.cfg

@@ -1,16 +1,16 @@
 # for avr
 
-   set  _CHIPNAME avr
-   set  _ENDIAN little
+   set _CHIPNAME avr
+   set _ENDIAN little
 
 # jtag speed
 adapter_khz 4500
 
-reset_config  srst_only
+reset_config srst_only
 adapter_nsrst_delay 100
 
 #jtag scan chain
-if { [info exists CPUTAPID ] } {
+if { [info exists CPUTAPID] } {
    set _CPUTAPID $CPUTAPID
 } else {
    set _CPUTAPID 0x8970203F