ARM: dts: ls1021a: remove property 'snps,host-vbus-glitches'

ARM: dts: ls1021a: remove property 'snps,host-vbus-glitches'

Commit 7e0685a0c4c27 ("arm64: dts: ls1012a: fix DWC3 USB VBUS glitch issue")
erroneously added this to ls1021a as well. Despite that apparently the
workaround has already been applied unconditional at
commit a6ba1e453174 ("usb: dwc3: apply snps,host-vbus-glitches workaround unconditionally")

Remove it to fix CHECK_DTBS warning:
  usb@3100000 (snps,dwc3): Unevaluated properties are not allowed ('snps,host-vbus-glitches' was unexpected)

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>