[PATCH 2/2] clk: imx8mp: use usb_core_ref for usb_root_clk

[sbabic at denx.de]

> Upstream commit 7a2c3be95a50 ("clk: imx8mp: Fill in DWC3 USB, USB PHY,
> HSIOMIX clock") added usb_core_ref for USB Controller but never set it
> to be used as a clock source, using rather "osc_32k" instead.
> This produces following boot log message:
> "clk_register: failed to get osc_32k device (parent of usb_root_clk)"
> Fix the USB controller clock source by using usb_core_ref instead of
> osc_32k.
> Fixes: 7a2c3be95a50 ("clk: imx8mp: Fill in DWC3 USB, USB PHY, HSIOMIX clock")
> Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin at leica-geosystems.com>
> Cc: Fabio Estevam <festevam at denx.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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