tuna: add power off support

Change-Id: Ie060726a2d7c7bd37a1c294701ce29c24a28275f
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
OMAP: tuna: Enable CONFIG_OMAP_RESET_CLOCKS

Currently resets the following clocks considered
unused at boot:

	auxclk4_ck (SCRM auxiliary clock #4 enable)
	hdq1w_fck (HDQ1W module software enable)
	gpmc_ick (GPMC module hardware enable)
	gpio1_dbclk (optional fclk for GPIO1)
	gpio3_dbclk
	gpio4_dbclk
	gpio5_dbclk
	gpio6_dbclk

Change-Id: I72239e9840cf7d27ed37dee321e9611b04d1304c
Signed-off-by: Todd Poynor <toddpoynor@google.com>