mach-k3: am62ax: enable caches for the SPL stage

board_init_f for the am62a is missing the call to spl_enable_cache which
exists for all other am62 platforms (check am625_init.c &
am62p5_init.c).

This allows the usage of caches while loading and parsing the u-boot.img
FIT resulting in ~2x speedup in the A53 SPL stage.

Signed-off-by: Anshul Dalal <anshuld@ti.com>

arch/arm/mach-k3/am62ax/am62a7_init.c

@@ -191,6 +191,7 @@ void board_init_f(ulong dummy)
 	if (ret)
 		panic("DRAM init failed: %d\n", ret);
 #endif
+	spl_enable_cache();
 
 	setup_qos();