pwm: pca9685: Use BIT() macro instead of shift

#define PCA9685_NUMREGS		0xFF

#define PCA9685_MAXCHAN		0x10

#define LED_FULL		(1 << 4)

#define MODE1_SLEEP		(1 << 4)

#define MODE2_INVRT		(1 << 4)

#define MODE2_OUTDRV		(1 << 2)

#define LED_FULL		BIT(4)

#define MODE1_SLEEP		BIT(4)

#define MODE2_INVRT		BIT(4)

#define MODE2_OUTDRV		BIT(2)

#define LED_N_ON_H(N)	(PCA9685_LEDX_ON_H + (4 * (N)))

#define LED_N_ON_L(N)	(PCA9685_LEDX_ON_L + (4 * (N)))