bootvx: x86: Explicitly clear the bootloader image size
VxWorks bootloader stores its size at a pre-defined offset @ 0x5004. Later when VxWorks kernel boots up and system memory information is retrieved from the E820 table, the bootloader size will be subtracted from the total system memory size to calculate the size of available memory for the OS. Explicitly clear the bootloader image size otherwise if memory at this offset happens to contain some garbage data, the final available memory size for the kernel is insane. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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