android: fiq_debugger: fix cut-off help message

fiq_debugger_printf has a 256 byte limit, which was causing the help
lines for "kmsg" and "version" to be dropped.  Split the long string
into two calls.

Change-Id: I55f9f030247cc16d13ae6236736311a5ef0c7aa0
Signed-off-by: Colin Cross <ccross@android.com>