armv8: fsl-layerscape: spl: remove BSS clearing and board_init_r

As per the top level U-Boot README "Board Initialisation Flow"
section, board_init_f() should return without calling board_init_r()
directly. Clearing BSS and calling board_init_r() will be done in
crt0_64.S.

Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/spl.c

@@ -61,10 +61,5 @@ void board_init_f(ulong dummy)
 	i2c_init_all();
 #endif
 	dram_init();
-
-	/* Clear the BSS */
-	memset(__bss_start, 0, __bss_end - __bss_start);
-
-	board_init_r(NULL, 0);
 }
 #endif