mfd: wcd9310: Make tabla interrupt line to be wakeable

Tabla hardware needs to wake up CPU by interrupt for headset
insertion/removal/button press functionalities.
Make Tabla's interrupt line as wakeable interrupt so driver gets
interrupt while CPU is suspend mode.

CRs-Fixed: 318317
Change-Id: Ie42938478ad66cb108a01abea1d0b01df7485e8b
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>