[PATCH] travis-ci: Update QEMU RISC-V run command

[Stephen Warren]

On 6/23/20 6:34 AM, Bin Meng wrote:
> From: Bin Meng <bin.meng at windriver.com>
> 
> Explicitly pass the "-bios" option to QEMU to run U-Boot, instead
> of the "-kernel" option, as we know that "-bios" behavior will be
> changed since QEMU 5.1.0.

Applied, thanks.