[linux] Power off routine for DuoVero TWL6030 PMIC

Courtesy of [1], this shuts down the DuoVero PMIC when
the user halts the board.

[1] https://github.com/gumstix/linux/pull/2

Signed-off-by: Ash Charles <ashcharles@gmail.com>
[linux] Add SD8787 Firmware Loading Patches

As discussed [1], Scott kindly backported two patches to help ensure
the firmware for the SD8787 Wifi/Bluetooth chip used on DuoVero Zephyr
is loaded consistently.

[1] http://gumstix.8.x6.nabble.com/Wifi-speeds-with-Duovero-Zephyr-td4967344.html

Signed-off-by: Ash Charles <ashcharles@gmail.com>
[linux] Enable RTC on DuoVero

Backport [1] to disable safe mode and allow the user to modify
the hwclock as discussed [2].

[1] http://kernel.opensuse.org/cgit/kernel/commit/?id=1ef43369c681bf30a980a4ba42df20514b15fdda
[2] http://gumstix.8.x6.nabble.com/Duovero-Ubuntu-Hardware-Clock-questions-td4967645.html

Signed-off-by: Ash Charles <ashcharles@gmail.com>