arm64: dts: imx93-pinfunc: drop execution permission

Drop the header file execution permission

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Fixes: ec8b5b50

 ("arm64: dts: freescale: Add i.MX93 dtsi support")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>