[PATCH v4 1/6] mfd: cros_ec: Add MKBP event support

From: Vic Yang Newer revisions of the ChromeOS EC add more events besides the keyboard ones. So handle interrupts in the MFD driver and let consumers register for notifications for the events they might care. To keep backward compatibility, if the EC doesn't support MKBP

[PATCH v4 1/6] mfd: cros_ec: Add MKBP event support

From: Vic Yang Newer revisions of the ChromeOS EC add more events besides the keyboard ones. So handle interrupts in the MFD driver and let consumers register for notifications for the events they might care. To keep backward compatibility, if the EC doesn't support MKBP event, we fall back to