imx8m: imx8mq: soc: fix get chip rev for B1 revision"

This reverts commit 308ca269.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

arch/arm/mach-imx/imx8m/soc.c

@@ -203,8 +203,8 @@ u32 get_cpu_rev(void)
 				rom_version =
 					readl((void __iomem *)ROM_VERSION_A0);
 				if (rom_version != CHIP_REV_1_0) {
-					rom_version = readl((void __iomem *)ROM_VERSION_B0);
-					if (rom_version == CHIP_REV_2_0)
+					rom_version = readl((void __iomem *)ROM_VERSION_B0) & 0xff;
+					if (rom_version >= CHIP_REV_2_0)
 						reg = CHIP_REV_2_0;
 				}
 			}