pxa: fix previous definition on cpu init

start.S:183:1: warning: "ICMR" redefined
In file included from start.S:33:
include/asm/arch/pxa-regs.h:935:1: warning: this is the location of the previous definition
start.S:187:1: warning: "RCSR" redefined
...
Signed-off-by: NJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

cpu/pxa/start.S

@@ -166,17 +166,13 @@ _start_armboot: .word start_armboot
 /*									    */
 /****************************************************************************/
 /* mk@tbd: Fix this! */
-#if defined(CONFIG_PXA250) || defined(CONFIG_CPU_MONAHANS)
+#undef RCSR
 #undef ICMR
 #undef OSMR3
 #undef OSCR
 #undef OWER
 #undef OIER
-#endif /* CONFIG_PXA250 || CONFIG_CPU_MONAHANS */
-#ifdef CONFIG_PXA250
-#undef RCSR
 #undef CCCR
-#endif /* CONFIG_PXA250 */
 
 /* Interrupt-Controller base address					    */
 IC_BASE:	   .word	   0x40d00000