u-boot-fslc: Update to 2014.10 upcoming release

This updates the U-Boot to the 2014.10 based branch. On top of the
original code we still have following changes applied:

75ce95e embestmx6boards: Change default bootenv configuration
472bfb3 ot1200: add sata support
4e8b5ee ot1200: fix sf detection
857ccfd ARM: i.MX6: include prototype for get_board_rev()
2b542e6 video: ipu_disp: remove pixclk fixup
499a8ca video: ipu: fix debug and comment
c970aa2 lcd: Fix build error with CONFIG_LCD_BMP_RLE8
37a6b36 mx6sabre_common: Add HDMI config to common code
56f29bf mx6qsabreauto: Add HDMI support
2878ac3 ot1200: remove superfluous "string" tag
d2104d6 ARM: i.MX video: declare displays and display_count publicly
2d6e2ec ARM: i.MX: provide declaration for board_spi_cs_gpio
d09ced3 ARM: prevent compiler warnings from bootm.c
34fd658 wandboard: Use 32bit color depth for Fusion LCD
92e4fa9 mx6sabresd: Use LDO dtb file until LDO bypass support is added
d859ee7 mx6slevk: Use LDO dtb file until LDO bypass support is added
47ac5b6 mx6sabresd: Use mmcblk0 for CONFIG_MMCROOT

Due the changes on the way U-Boot works now, heavily relying on
kconfig, it is required to use the 'configure' step to properly setup
it for the 'sandbox' before building the tools.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
imx6dlsabreauto: Change to use u-boot-fslc

This board is now supported by u-boot-fslc so we move from u-boot-imx
to it; this is preferred as this U-Boot fork follows closely the
mainline tree which brings faster development cycle and helps to
extend the test of i.MX6 support.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>