x86: Add generic EFI payload support

It is possible to create a generic EFI payload for all x86 boards.
The payload is configured to include as many generic drivers as
possible. All stuff that touches low-level initialization are not
allowed as such is the EFI BIOS's responsibility. Platform specific
drivers (like gpio, spi, etc) are not included.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/efi/efi-x86_payload/Kconfig b/board/efi/efi-x86_payload/Kconfig
new file mode 100644
index 0000000..dcf4de8
--- /dev/null
+++ b/board/efi/efi-x86_payload/Kconfig
@@ -0,0 +1,38 @@
+if TARGET_EFI_PAYLOAD
+
+config SYS_BOARD
+	default "efi-x86_payload"
+
+config SYS_VENDOR
+	default "efi"
+
+config SYS_SOC
+	default "efi"
+
+config SYS_CONFIG_NAME
+	default "efi-x86_payload"
+
+config SYS_TEXT_BASE
+	default 0x00200000
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	imply SYS_NS16550
+	imply SCSI
+	imply SCSI_AHCI
+	imply AHCI_PCI
+	imply MMC
+	imply MMC_PCI
+	imply MMC_SDHCI
+	imply MMC_SDHCI_SDMA
+	imply USB
+	imply USB_EHCI_HCD
+	imply USB_XHCI_HCD
+	imply USB_STORAGE
+	imply USB_KEYBOARD
+	imply E1000
+	imply ETH_DESIGNWARE
+	imply PCH_GBE
+	imply RTL8169
+
+endif