uboot-imx

MLK-16186: spi: flexspi: reset the flexspi DLL register to default value

i.MX8QM ROM didn't calculate the DLL correctly in some cases, to avoid
the wrong DLL setting impact the following functions, reset them to the
default value when probe.

Signed-off-by: Han Xu <han.xu@nxp.com>
(cherry picked from commit da3c2a9f09afa45a428809b7bf3f981a1ccb7f2e)
(cherry picked from commit 71368855b63c16998ca5681984e70a913e1f4d84)