radio: RTC6226: remove the V4L2_CAP_DEVICE_CAPS cap as device_caps

V4l2 framewrok warn that Drivers must not change device_caps.
There is a device cap mismatch when querying device capabilities
for rtc6226 driver compared to cap filled at probe time.
Remove the V4L2_CAP_DEVICE_CAPS cap as device_caps during rtc6226
driver probe.

CRs-Fixed: 2691794
Change-Id: Ice3c0cbbf583762a500647f4a54f68f92d6586bb
Signed-off-by: himta ram <hram@codeaurora.org>