cpu: imx: fix the CPU type field width

Increase one more bit to cover all CPU types. Otherwise it shows
wrong CPU info on some platforms, such as i.MX8M Plus:

    U-Boot 2024.04+g674440bc73e+p0 (Jun 06 2024 - 10:05:34 +0000)

    CPU:   NXP i.MX8MM Rev1.1 A53 at 4154504685 MHz at 30C

    Model: NXP i.MX8MPlus LPDDR4 EVK board

Signed-off-by: Hou Zhiqiang <[email protected]>

Author: Zhiqiang-Hou

drivers/cpu/imx8_cpu.c

@@ -287,7 +287,7 @@ static int imx_cpu_probe(struct udevice *dev)
 	cpurev = get_cpu_rev();
 	plat->cpurev = cpurev;
 	plat->rev = get_imx_rev_str(cpurev & 0xFFF);
-	plat->type = get_imx_type_str((cpurev & 0xFF000) >> 12);
+	plat->type = get_imx_type_str((cpurev & 0x1FF000) >> 12);
 	plat->freq_mhz = imx_get_cpu_rate(dev) / 1000000;
 	plat->mpidr = dev_read_addr(dev);
 	if (plat->mpidr == FDT_ADDR_T_NONE) {