config: Enable support for the XHCI controller on RPI4 board

This requires enabling BRCMSTB PCIe and XHCI_PCI drivers as well as PCI
and USB commands. To get it working one has to call the following commands:
"pci enum; usb start;", thus such commands have been added to the default
"preboot" environment variable. One has to update their environment if it
is already configured to get this feature working out of the box.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

configs/rpi_4_32b_defconfig

@@ -6,6 +6,8 @@ CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_ENV_SIZE=0x4000
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="pci enum; usb start;"
 CONFIG_MISC_INIT_R=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
@@ -13,6 +15,8 @@ CONFIG_SYS_PROMPT="U-Boot> "
 CONFIG_CMD_DFU=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_USB=y
 CONFIG_CMD_FS_UUID=y
 CONFIG_OF_BOARD=y
 CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"
@@ -26,12 +30,17 @@ CONFIG_MMC_SDHCI_SDMA=y
 CONFIG_MMC_SDHCI_BCM2835=y
 CONFIG_DM_ETH=y
 CONFIG_BCMGENET=y
+CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_PCI_BRCMSTB=y
 CONFIG_PINCTRL=y
 # CONFIG_PINCTRL_GENERIC is not set
 # CONFIG_REQUIRE_SERIAL_CONSOLE is not set
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_DM_USB_GADGET=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_PCI=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_MANUFACTURER="FSL"
 CONFIG_USB_GADGET_VENDOR_NUM=0x0525
@@ -44,4 +53,6 @@ CONFIG_DM_VIDEO=y
 CONFIG_SYS_WHITE_ON_BLACK=y
 CONFIG_CONSOLE_SCROLL_LINES=10
 CONFIG_PHYS_TO_BUS=y
+CONFIG_ADDR_MAP=y
+CONFIG_SYS_NUM_ADDR_MAP=2
 CONFIG_OF_LIBFDT_OVERLAY=y