ipq806x: consolidate DTS files directory

Commit 29ca10e537ee ("ipq806x: remove support for kernel 4.19") moved
DTS files to "files" directory, but after that a new DTS file was added
to the former "files-5.4" directory. Move it to the new directory.

Fixes: 98b86296e67d ("ipq806x: add support for ASRock G10")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>

diff --git a/target/linux/ipq806x/files-5.4/arch/arm/boot/dts/qcom-ipq8064-g10.dts b/target/linux/ipq806x/files/arch/arm/boot/dts/qcom-ipq8064-g10.dts
similarity index 100%
rename from target/linux/ipq806x/files-5.4/arch/arm/boot/dts/qcom-ipq8064-g10.dts
rename to target/linux/ipq806x/files/arch/arm/boot/dts/qcom-ipq8064-g10.dts