radio: iris: Expose FM Radio commands and events to user-space

Move the FM command and event structure declarations to separate header
file and include it in FM Radio driver.

Change-Id: Id664eab476240a54a1bc8db656bc9dc95a252bdb
CRs-Fixed: 436286
Signed-off-by: Venkateshwarlu Domakonda <Venkateshwarlu@codeaurora.org>
radio-iris: Configure repeat count for PS string

- When FM Rx tuned to a station, not receiving complete PS string.
  SOC is not waiting for complete PS string. it is sending PS event
  even if it has part of PS string as well.
- Added support for setting repeat count for PS string
  to get refined PS string from receiver.

CRs-Fixed: 474719
Change-Id: I71c0c1c8af9488573c05d816c37982f9ed935a87
Signed-off-by: Venkateshwarlu Domakonda <Venkateshwarlu@codeaurora.org>
radio: iris: Add the parameter to turn on/off sig blend

FM driver will always enable the sig blend feature, it will cause
FM seperation failure during lab test.So add this new parameter
to disable the feature by adb command to pass the test.

Change-Id: I187d4e5fff4aabfb994a905e174bb8ce941e2c16
Signed-off-by: Sheng Fang <fsheng@codeaurora.org>

Conflicts:
	drivers/media/radio/radio-iris.c
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