Select U-Boot proper boot peripheral based on boot mode #16
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A silicon issue means that booting from eMMC requires programming the OTP. Additionally booting from SPI flash is much faster than eMMC. However future DSP processors will fix these issues so we should be able to support both without requiring to reconfigure and rebuild U-Boot for each case.
Note this does not handle the case where the boot loaders are loaded from SPI flash and then the runtime OS is loaded from the SD card. This is done because the boot ROM can not load the first stage boot loader from a SD card.