example: register for events after setting up the stack, register for hci events after sm_init()

example: fix warnings for printf of uint32_t values

hid_host_demo: use new HID parser to decode keyboard and simulate terminal

hid_host_demo: fix compile

hid_host_demo: larger max attribute value for larger hid descriptor length

hid_host_demo: open l2ap channels and print received packets

hid_host_demo: query SDP HID record for PSMs and HID Descriptor