ARM: tegra: Add support for TK1-SOM board from Colorado Engineering

The Colorado TK1 SOM is a small form factor board similar to the
Jetson TK1.  The main differences lie in the pinmux, and in that the
PCIe controller is set to use in 4lanes+1lane, rather than 2+2.

The pinmux header here was generated from a spreadsheet provided by
Colorado Engineering using the tegra-pinmux scripts.  The spreadsheet
was converted from v09 to v11 by me.

Signed-off-by: Peter Chubb <peter.chubb@data61.csiro.au>

configs/cei-tk1-som_defconfig

@@ -0,0 +1,47 @@
+CONFIG_ARM=y
+CONFIG_TEGRA=y
+CONFIG_SPL_DM=y
+CONFIG_TEGRA124=y
+CONFIG_TARGET_CEI_TK1_SOM=y
+CONFIG_DEFAULT_DEVICE_TREE="tegra124-cei-tk1-som"
+CONFIG_OF_SYSTEM_SETUP=y
+CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="Tegra124 (TK1-SOM) # "
+CONFIG_CMD_BOOTZ=y
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_DFU=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+# CONFIG_CMD_FPGA is not set
+CONFIG_CMD_GPIO=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
+# CONFIG_CMD_NFS is not set
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_RTL8169=y
+CONFIG_PCI_TEGRA=y
+CONFIG_SYS_NS16550=y
+CONFIG_TEGRA114_SPI=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_GADGET=y
+CONFIG_CI_UDC=y
+CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_G_DNL_MANUFACTURER="NVIDIA"
+CONFIG_G_DNL_VENDOR_NUM=0x0955
+CONFIG_G_DNL_PRODUCT_NUM=0x701a
+CONFIG_USE_PRIVATE_LIBGCC=y