Revert "Align global_data to a 16-byte boundary"

This causes widespread breakage due to the operation of the low-level code
in crt0.S and cro0_64.S for ARM at least.

The fix is not complicated but it seems safer to revert this for now.

This reverts commit 2afddae07523f23f77acd066ad1719f53d289f98.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index cc369fc..2155265 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -99,8 +99,7 @@
 	int pcidelay_done;
 #endif
 	struct udevice *cur_serial_dev;	/* current serial device */
-	/* arch-specific data */
-	struct arch_global_data arch __attribute__((aligned(16)));
+	struct arch_global_data arch;	/* architecture-specific data */
 } gd_t;
 #endif