PalmSystem: use new org.webosports.notifications service name

Signed-off-by: Simon Busch <morphis@gravedo.de>
PalmSystem: implement removeBannerMessage

Signed-off-by: Simon Busch <morphis@gravedo.de>
PalmSystem: don't attempt to parse when result from actual load is empty

Signed-off-by: Simon Busch <morphis@gravedo.de>
Only log debug messages when verbose logging is enabled

Signed-off-by: Simon Busch <morphis@gravedo.de>