cardhu: defconfig: enable zram
TF700T: add support for ec_wakeup (kernel)

* Added asusdec_show_ec_wakeup sysfs show function. This allow access to ec_wakeup status

Change-Id: I3292d531b3b0dccd171773e875dbd0cb0bb67d17
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>