Flash is25lp032d fails to enter sleep mode after erase.

I am using is25lp03d flash with "nordic,qspi-nor" driver. 

The issue is that nrf_qspi_nor.c driver uses `nrfx_qspi_mem_busy_check()` before entering suspend mode. This function repeatedly returns -EBUSY after erasing some portion of flash.

The solution to the problem is to include `.wipwait = true` to the config structure of the `nrfx_qspi_mem_busy_check()` function.

Should that change be included in the code?

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