usb: ehci-msm-hsic: Enable HSIC CORE IRQ as wakeup source

HSIC core irq is required to enable as wakeup source with MPM
pin configuration to support bus supsend/resume functionality
with XO/VDD min. This change is used to enable wakeup source
for HSIC core irq.

Change-Id: I931e35b8c8233ba491afab7d604ffc6b6300ab12
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>