thermal/drivers/imx8mm_thermal: Use GENMASK() when appropriate

GENMASK() is preferred to use for bitmasks.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Link: https://lore.kernel.org/r/20221014081620.1599511-1-marcus.folkesson@gmail.comSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/thermal/imx8mm_thermal.c

@@ -23,8 +23,8 @@
 
 #define TER_ADC_PD		BIT(30)
 #define TER_EN			BIT(31)
-#define TRITSR_TEMP0_VAL_MASK	0xff
-#define TRITSR_TEMP1_VAL_MASK	0xff0000
+#define TRITSR_TEMP0_VAL_MASK	GENMASK(7, 0)
+#define TRITSR_TEMP1_VAL_MASK	GENMASK(23, 16)
 
 #define PROBE_SEL_ALL		GENMASK(31, 30)