msm: otg: Handle otg interrupts only if they are enabled
msm: otg: Handle otg interrupts only if they are enabled

without this check driver tries to handles otgsc session valid
interrupt when interrupt source is any other otg interrupt.

Change-Id: Ic32ab9784509ddbfbb985f7990e87e221ff0a1b1
Signed-off-by: Vamsi Krishna <47b0e29304cd078485ecf21b4f20d61eb25fd047@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas