PCU_E: remove code for yet another corpse

The PCU_E board has long reached EOL, and support for it is no longer
relevant in current versions of U-Boot.  Remove it.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/README b/README
index 171e0d6..f997a5d 100644
--- a/README
+++ b/README
@@ -1781,7 +1781,7 @@
 
 			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
 			HERMES, IP860, RPXlite, LWMON, LANTEC,
-			PCU_E, FLAGADM, TQM8260
+			FLAGADM, TQM8260
 
 - Error Recovery:
 		CONFIG_PANIC_HANG