serial: lpuart: Enable IPG clock
Current codes only ennable the PER clock. However on iMX8 the LPUART also needs IPG clock which is an LPCG. Should not depend on the default LPCG setting. Signed-off-by:Ye Li <ye.li@nxp.com> Reviewed-by:
Peng Fan <peng.fan@nxp.com> Signed-off-by:
Sébastien Szymanski <sebastien.szymanski@armadeus.com>
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