msm: 8064: Increase pull-up strength for pmic gpio-keys

Increase the pull up strength (current source pulls) from
1.5uA to 30uA for devices (MTP and XPM) which do not have
external pull-ups.

Also, fix the pmic gpio number for HOME key (pm gpio 27)
which was earlier being configured to 37.

Change-Id: Iedf734efd6fac107cae590ff0bdd5e79017e73e8
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>