wifi: wilc1000: Re-enable RTC clock on resume

The wilc_sdio_suspend() does clk_disable_unprepare() on rtc_clk clock,
make sure wilc_sdio_resume() does matching clk_prepare_enable(), else
any suspend/resume cycle leads to clock disable/enable imbalance. Fix
the imbalance.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20240821183717.163235-1-marex@denx.de

drivers/net/wireless/microchip/wilc1000/sdio.c

@@ -1006,6 +1006,9 @@ static int wilc_sdio_resume(struct device *dev)
 	if (!wilc->initialized)
 		return 0;
 
+	if (!IS_ERR(wilc->rtc_clk))
+		clk_prepare_enable(wilc->rtc_clk);
+
 	wilc_sdio_init(wilc, true);
 	wilc_sdio_enable_interrupt(wilc);