reset: npcm: fix iprst2 and iprst4 setting

In NPCM8XX USB reset sequence, iprst2 register was set with iprst4 value
and iprst4 register wasn´t set.

This fix sets the correct IP reset values in iprst2 and iprst4 registers
in NPCM8XX USB reset sequence.

Fixes: fc5d2a2f

 ("reset: npcm: Add NPCM8XX support")

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220922153856.23326-1-tmaimon77@gmail.com