bootm: refactor entry point code

Move entry point code out of each arch and into common code.
Keep the entry point in the bootm_headers_t images struct.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/lib_sh/bootm.c b/lib_sh/bootm.c
index 4ee7ff3..9d2c908 100644
--- a/lib_sh/bootm.c
+++ b/lib_sh/bootm.c
@@ -62,26 +62,9 @@
 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
 		     bootm_headers_t *images)
 {
-	ulong	ep = 0;
 	char	*bootargs = getenv("bootargs");
 
-	/* find kernel entry point */
-	if (images->legacy_hdr_valid) {
-		ep = image_get_ep (&images->legacy_hdr_os_copy);
-#if defined(CONFIG_FIT)
-	} else if (images->fit_uname_os) {
-		int ret = fit_image_get_entry (images->fit_hdr_os,
-				images->fit_noffset_os, &ep);
-		if (ret) {
-			puts ("Can't get entry point property!\n");
-			goto error;
-		}
-#endif
-	} else {
-		puts ("Could not find kernel entry point!\n");
-		goto error;
-	}
-	void (*kernel) (void) = (void (*)(void))ep;
+	void (*kernel) (void) = (void (*)(void))images->ep;
 
 	/* Setup parameters */
 	memset(PARAM, 0, 0x1000);	/* Clear zero page */