misc: modem_if: Add modem interface driver

1. Update modem interface driver based on TI HSI patch.
	- TI HSI patch
	: Change I01715849: omap4: hsi driver initial commit
	: Change I14d257ae: ARM: omap: tuna: add HSI support
        : Change Icebb37db: omap4: enable hsi hwmod
        : Change Iec8eef73: tuna: defcoinfig: enable HSI
2. Checked Modem BootUp and MIPI communication working.

Change-Id: I75a2d960f3a66004fa81743fae931f04bd4f0c07
Signed-off-by: wonhee <wonhee48.seo@samsung.com>

Conflicts:
	drivers/misc/Kconfig
ARM: omap4: tuna: Add board-tuna-modems.c

Change-Id: I67650ca73ee591bee684a33f1f227bfad9fa6423
Signed-off-by: wonhee <wonhee48.seo@samsung.com>