clk: imx93: correct the flexspi1 clock setting

Correct IMX93_CLK_FLEXSPI1_GATE CCGR setting. Otherwise the flexspi
always can't be assigned to a parent clock when dump the clock tree.

Fixes: 24defbe1 ("clk: imx: add i.MX93 clk")
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/1666589199-1199-1-git-send-email-haibo.chen@nxp.com