imx8m: lowlevel_init: tune alignment

The minimum alignment is 16 bytes, so use align 4 is enough.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8m/lowlevel_init.S b/arch/arm/mach-imx/imx8m/lowlevel_init.S
index a49a9cd..dd263c4 100644
--- a/arch/arm/mach-imx/imx8m/lowlevel_init.S
+++ b/arch/arm/mach-imx/imx8m/lowlevel_init.S
@@ -5,7 +5,7 @@
 
 #include <config.h>
 
-.align 8
+.align 4
 .global rom_pointer
 rom_pointer:
 	.space 256