arm64: dts: imx8qxp: add alias for lsio MU

Add lsio mu alias for all lsio MUs that could communicate with SCU,
imx_scu_enable_general_irq_channel will parse the alias to get
the mu resource id, if using other MU, not MU1, the `mu_resource_id`
is not what we expect, so add alias to fix this issue.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qxp.dtsi

@@ -30,7 +30,11 @@ aliases {
 		mmc0 = &usdhc1;
 		mmc1 = &usdhc2;
 		mmc2 = &usdhc3;
+		mu0 = &lsio_mu0;
 		mu1 = &lsio_mu1;
+		mu2 = &lsio_mu2;
+		mu3 = &lsio_mu3;
+		mu4 = &lsio_mu4;
 		serial0 = &adma_lpuart0;
 		serial1 = &adma_lpuart1;
 		serial2 = &adma_lpuart2;