projects/Amlogic: LePotato: faster booting by not trying to parse env/dtb on boot

env and dtb are not present on SD card, if we don't parse them we save time.

projects/Amlogic/devices/LePotato/packages/u-boot/patches/u-boot-0004-faster-boot.patch

@@ -60,3 +60,38 @@ index b3ccfae..6052a87 100644
  #define CONFIG_FASTBOOT_FLASH_MMC_DEV 1
  #define CONFIG_FASTBOOT_FLASH 1
  #define CONFIG_USB_GADGET 1
+diff --git a/board/amlogic/libretech_cc/libretech_cc.c b/board/amlogic/libretech_cc/libretech_cc.c
+index 33bd007..b1748d9 100644
+--- a/board/amlogic/libretech_cc/libretech_cc.c
++++ b/board/amlogic/libretech_cc/libretech_cc.c
+@@ -417,13 +417,6 @@ U_BOOT_CMD(hdmi_init, CONFIG_SYS_MAXARGS, 0, do_hdmi_init,
+ #endif
+ #ifdef CONFIG_BOARD_LATE_INIT
+ int board_late_init(void){
+-	//update env before anyone using it
+-	run_command("get_rebootmode; echo reboot_mode=${reboot_mode}; "\
+-			"if test ${reboot_mode} = factory_reset; then "\
+-			"defenv_reserv aml_dt;setenv upgrade_step 2;save; fi;", 0);
+-	run_command("if itest ${upgrade_step} == 1; then "\
+-				"defenv_reserv; setenv upgrade_step 2; saveenv; fi;", 0);
+-
+ #ifndef CONFIG_AML_IRDETECT_EARLY
+ 	/* after  */
+ 	run_command("cvbs init;hdmitx hpd", 0);
+@@ -448,16 +441,10 @@ int board_late_init(void){
+ #elif defined(CONFIG_DTB_MEM_ADDR)
+ 		{
+ 				char cmd[128];
+-				int ret;
+                 if (!getenv("dtb_mem_addr")) {
+ 						sprintf(cmd, "setenv dtb_mem_addr 0x%x", CONFIG_DTB_MEM_ADDR);
+ 						run_command(cmd, 0);
+ 				}
+-				sprintf(cmd, "imgread dtb boot ${dtb_mem_addr}");
+-				ret = run_command(cmd, 0);
+-                                if (ret) {
+-						printf("%s(): cmd[%s] fail, ret=%d\n", __func__, cmd, ret);
+-				}
+ 		}
+ #endif// #ifndef DTB_BIND_KERNEL
+ #ifdef CONFIG_AML_V2_FACTORY_BURN