linux-phytec-ti

usb: dwc3: keystone: Add PM_RUNTIME Support to DWC3 Keystone USB driver

For 66AK2Gx calling clk_prepare_enable isn't enough to enable the clocks
with the new clock driver. Therefore, replace clock enables and disables
with pm_runtime equivalent calls which are needed. Without this the driver
will throw and external abort error once it tries to read the peripherals'
register while the clock isn't enabled.

Verified on both K2G EVM and K2E EVM by performing basic test interacting
with a USB thumbdrive and removing and adding back the driver module.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>