clk: rockchip: rk3568: Mark pclk_usb as critical

In the reference manual under "2.8.6 NIU Clock gating reliance"
it is stated that pclk_usb_niu has a dependency on hclk_usb_niu.

While the manual does not state that this is a bi-directional
relationship it was noted that the sdmmc2 failed to operate for me in
mmc mode if the pclk_usb was not marked as critical. The parent clock
of the hclk_sdmmc2 is hclk_usb.

Signed-off-by: Chris Morgan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: macromorgan

drivers/clk/rockchip/clk-rk3568.c

@@ -1594,6 +1594,7 @@ static const char *const rk3568_cru_critical_clocks[] __initconst = {
 	"hclk_php",
 	"pclk_php",
 	"hclk_usb",
+	"pclk_usb",
 	"hclk_vo",
 };