Raw Kernel Image Support for Falcon Mode Boot Via SPI Devices

[Nathan Barrett-Morrison]

Hi All,

While trying to bring up Falcon Mode boot on an ARM64 board, I've
discovered that the SPL+SPI(spl_spi.c) driver does not allow us to load a
raw kernel image and subsequently call the bootz_setup() function which
resides in spl_parse_image_header().

I've added a new config option (CONFIG_SYS_SPI_KERNEL_SKIP_HEADER) which
will skip the mkimage header check, allowing the subsequent
spl_parse_image_header() call to successfully fall through to bootz_setup()
and load/boot a raw kernel image.

Sincerely,
Nathan Barrett-Morrison
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