OMAP4: hwmod & clock data: Fix GPIO opt_clks and ocp_if iclk

Fix opt clocks name in clock framework and hwmod.

Add the missing iclk in the ocp_if structure.

Add the HWMOD_CONTROL_OPT_CLKS_IN_RESET flag to ensure
the the GPIO optional clock is enable during reset.

Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Tested-by: Charulatha V <charu@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Rajendra Nayak <rnayak@ti.com>