board/eltec/elppc/misc.c: Fix GCC 4.6 build warning

Fix:
misc.c: In function 'misc_init_r':
misc.c:119:3: warning: dereferencing type-punned pointer
will break strict-aliasing rules [-Wstrict-aliasing]

Signed-off-by: Anatolij Gustschin <agust@denx.de>

board/eltec/elppc/misc.c

@@ -116,7 +116,7 @@ int misc_init_r (void)
 		eerev.etheraddr[5] = 0x4D;
 
 		/* cache config word for ELPPC */
-		*(int *) &eerev.res[0] = 0;
+		memset(&eerev.res[0], 0, 4);
 
 		initSrom = 1;	/* force dialog */
 		copyNv = 1;	/* copy to nvram */