imx8m: imx8mq: get chip rev for B1 revision

The i.MX8MQ B1 uses OCOTP_HW_OCOTP_READ_FUSE_DATA register for chip id.
It returns a magic number 0xff0055aa. update get_cpu_rev to support it,
and enable ocotp clock to access ocotp.

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

arch/arm/mach-imx/imx8m/clock_imx8mq.c

@@ -854,6 +854,7 @@ int clock_init(void)
 
 	init_wdog_clk();
 	clock_enable(CCGR_TSENSOR, 1);
+	clock_enable(CCGR_OCOTP, 1);
 
 	return 0;
 }

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

@@ -190,20 +190,21 @@ u32 get_cpu_rev(void)
 	} else {
 		if (reg == CHIP_REV_1_0) {
 			/*
-			 * For B0 chip, the DIGPROG is not updated, still TO1.0.
-			 * we have to check ROM version further
+			 * For B0 chip, the DIGPROG is not updated,
+			 * it is still TO1.0. we have to check ROM
+			 * version or OCOTP_READ_FUSE_DATA.
+			 * 0xff0055aa is magic number for B1.
 			 */
-			if (readl((void __iomem *)(OCOTP_BASE_ADDR + 0x40))
-					== 0xff0055aa) {
-				/* 0xff0055aa is magic number for B1 */
-				reg = 0x21;
+			if (readl((void __iomem *)(OCOTP_BASE_ADDR + 0x40)) == 0xff0055aa) {
+				reg = CHIP_REV_2_1;
 			} else {
 #define ROM_VERSION_A0		0x800
 #define ROM_VERSION_B0		0x83C
-				rom_version = readl((void __iomem *)ROM_VERSION_A0);
+				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)
+					if (rom_version == CHIP_REV_2_0)
 						reg = CHIP_REV_2_0;
 				}
 			}