arm: kirkwood: pogo_v4: Add Distro boot capability

- Add distro boot to board include file and deconfig file
- Miscellaneous changes:
	- Add CONFIG_SUPPORT_PASSING_ATAGS and friends to support legacy
	kernel method of booting (e.g. OpenWrt) with appended DTB.
	- Add CONFIG_LTO and CONFIG_UBIFS_SILENCE_MSG, and disable some
	unused configs	to reduce binary size.

Note that this patch is depended on the following patch:
https://patchwork.ozlabs.org/project/uboot/patch/20220807192709.21717-1-pali@kernel.org/

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
diff --git a/configs/pogo_v4_defconfig b/configs/pogo_v4_defconfig
index c62c88f..7488421 100644
--- a/configs/pogo_v4_defconfig
+++ b/configs/pogo_v4_defconfig
@@ -4,6 +4,9 @@
 CONFIG_ARCH_CPU_INIT=y
 CONFIG_SYS_THUMB_BUILD=y
 CONFIG_ARCH_KIRKWOOD=y
+CONFIG_SUPPORT_PASSING_ATAGS=y
+CONFIG_CMDLINE_TAG=y
+CONFIG_INITRD_TAG=y
 CONFIG_SYS_KWD_CONFIG="board/cloudengines/pogo_v4/kwbimage.cfg"
 CONFIG_SYS_TEXT_BASE=0x600000
 CONFIG_SYS_MALLOC_F_LEN=0x400
@@ -13,23 +16,24 @@
 CONFIG_DEFAULT_DEVICE_TREE="kirkwood-pogoplug-series-4"
 CONFIG_IDENT_STRING="\nPogoplug V4"
 CONFIG_SYS_LOAD_ADDR=0x800000
+CONFIG_LTO=y
+CONFIG_DISTRO_DEFAULTS=y
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0xc8012000
 CONFIG_BOOTSTAGE=y
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_BOOTDELAY=10
-CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="setenv bootargs ${bootargs_console}; run bootcmd_usb; bootm 0x00800000 0x01100000 0x2c00000"
 CONFIG_USE_PREBOOT=y
 CONFIG_BOARD_LATE_INIT=y
-CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="Pogo_V4> "
 CONFIG_SYS_MAXARGS=32
 CONFIG_SYS_PBSIZE=1050
-CONFIG_CMD_BOOTZ=y
 # CONFIG_BOOTM_PLAN9 is not set
 # CONFIG_BOOTM_RTEMS is not set
 # CONFIG_BOOTM_VXWORKS is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_XIMG is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_MMC=y
 CONFIG_CMD_MTD=y
@@ -37,22 +41,14 @@
 CONFIG_CMD_PCI=y
 CONFIG_CMD_SATA=y
 CONFIG_CMD_USB=y
-CONFIG_CMD_DHCP=y
-CONFIG_CMD_MII=y
-CONFIG_CMD_PING=y
 CONFIG_CMD_SNTP=y
 CONFIG_CMD_DNS=y
-CONFIG_CMD_EXT2=y
-CONFIG_CMD_EXT4=y
-CONFIG_CMD_FAT=y
-CONFIG_CMD_FS_GENERIC=y
+# CONFIG_CMD_BLOCK_CACHE is not set
 CONFIG_CMD_JFFS2=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nand0=orion_nand"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=orion_nand:2M(u-boot),3M(uImage),3M(uImage2),8M(failsafe),112M(root)"
 CONFIG_CMD_UBI=y
-CONFIG_ISO_PARTITION=y
-CONFIG_EFI_PARTITION=y
 CONFIG_PARTITION_TYPE_GUID=y
 CONFIG_OF_CONTROL=y
 CONFIG_ENV_OVERWRITE=y
@@ -62,6 +58,7 @@
 CONFIG_NETCONSOLE=y
 CONFIG_SYS_FAULT_ECHO_LINK_DOWN=y
 CONFIG_DM=y
+# CONFIG_DM_WARN is not set
 CONFIG_SATA_MV=y
 CONFIG_SYS_SATA_MAX_DEVICE=1
 CONFIG_LBA48=y
@@ -84,6 +81,6 @@
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_PCI=y
 CONFIG_USB_EHCI_HCD=y
-CONFIG_USB_STORAGE=y
 CONFIG_JFFS2_LZO=y
 CONFIG_JFFS2_NAND=y
+CONFIG_UBIFS_SILENCE_MSG=y