qpnp: pwm: Select proper pwm sizes

Here are different Qualcomm pmic chipsets and supported pwm resolutions.
PM8941:-
	LPG1 to LPG8 channels support 6, 7 and 9 bit PWM resolutions.
	LPG9 to LPG12 channels support 7 and 8 bit PWM resolutions.
PM8026:-
	LPG1 to LPG6 channels support 6, 7 and 9 bit PWM resolutions.
PM8110:-
	PWM supports 6 and 9 bit PWM resolutions. There is no support
for LPG mode and pwm mode only supported.

CRs-Fixed: 529920
Change-Id: I98323f94b2f6feef068300d7b0065082587ad548
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>