media: i2c: imx477: Correct IMX477_REG_TEST_PATTERN to be 16bit #4327

Job	Run time
build (arm64, arm64, defconfig, kernel8)	22m 0s
build (bcm2835, arm, bcm2835_defconfig, kernel)	7m 4s
build (bcmrpi, arm, bcmrpi_defconfig, kernel)	19m 17s
build (bcm2709, arm, bcm2709_defconfig, kernel7)	20m 3s
build (bcm2711_rt, arm64, bcm2711_rt_defconfig, kernel8_rt)	25m 24s
build (bcm2711, arm64, bcm2711_defconfig, kernel8)	25m 46s
build (bcm2712, arm64, bcm2712_defconfig, kernel_2712)	27m 17s
	2h 26m 51s

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