libpayload: Fix use of virtual pointers in sysinfo

In I4c456f5, I falsely identified struct cb_string.string as a pointer
which it is not. So we don't need phys_to_virt() here.

Change-Id: I3e2b6226ae2b0672dfc6e0fa4f6990e14e1b7089
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/1987
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/libpayload/arch/i386/coreboot.c

@@ -150,7 +150,7 @@ static void cb_parse_framebuffer(void *ptr, struct sysinfo_t *info)
 
 static void cb_parse_string(unsigned char *ptr, char **info)
 {
-	*info = (char *)phys_to_virt(((struct cb_string *)ptr)->string);
+	*info = (char *)((struct cb_string *)ptr)->string;
 }
 
 static int cb_parse_header(void *addr, int len, struct sysinfo_t *info)