imx: imx8qxp_mek: update README

Update README to use 4.19.35_1.1.0 released firmware images.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

board/freescale/imx8qxp_mek/README

@@ -14,28 +14,24 @@ Get and Build the ARM Trusted firmware
 
 $ git clone https://source.codeaurora.org/external/imx/imx-atf
 $ cd imx-atf/
-$ git checkout origin/imx_4.9.88_imx8qxp_beta2 -b imx_4.9.88_imx8qxp_beta2
-$ make PLAT=imx8qxp bl31
+$ git checkout origin/imx_4.19.35_1.1.0 -b imx_4.19.35_1.1.0
+$ make PLAT=imx8qx bl31
 
 Get scfw_tcm.bin and ahab-container.img
 ==============================
 
-$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-sc-firmware-0.7.bin
-$ chmod +x imx-sc-firmware-0.7.bin
-$ ./imx-sc-firmware-0.7.bin
-$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-7.6.bin
-$ chmod +x firmware-imx-7.6.bin
-$ ./firmware-imx-7.6.bin
+$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-sc-firmware-1.2.7.1.bin
+$ chmod +x imx-sc-firmware-1.2.7.1.bin
+$ ./imx-sc-firmware-1.2.7.1.bin
+$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-seco-2.3.1.bin
+$ chmod +x imx-seco-2.3.1.bin
+$ ./imx-seco-2.3.1.bin
 
 Copy the following binaries to U-Boot folder:
 
-$ cp imx-atf/build/imx8qxp/release/bl31.bin .
-$ cp u-boot/u-boot.bin .
-
-Copy the following firmwares U-Boot folder :
-
-$ cp firmware-imx-7.6/firmware/seco/ahab-container.img .
-$ cp imx-sc-firmware-0.7/mx8qx-mek-scfw-tcm.bin	.
+$ cp imx-atf/build/imx8qx/release/bl31.bin .
+$ cp imx-seco-2.3.1/firmware/seco/mx8qx-ahab-container.img ./ahab-container.img
+$ cp imx-sc-firmware-1.2.7.1/mx8qx-mek-scfw-tcm.bin	.
 
 Build U-Boot
 ============