[PATCH v2] mach-imx: bootaux: fix building with disabled bootelf

[sbabic at denx.de]

> If CMD_ELF disabled and IMX_BOOTAUX enabled, the u-boot building ends
> up with a linking error [1]. Select LIB_ELF to fix the building
> issue.
> [1]
> ld: /tmp/ccaF1rpv.ltrans0.ltrans.o: in function `do_bootaux':
> arch/arm/mach-imx/imx_bootaux.c:108: undefined reference to `valid_elf_image'
> Fixes: c0f037f6a2a ("mach-imx: bootaux: elf firmware support")
> Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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