defconfig: sa415m: Rename defconfigs and enable boot marker

Rename debug and perf defconfigs to make it same as machine
name for sa415m auto telematics target.

Also enabling boot marker config. BOOT_MARKER will create a
separate sys entry which contains all boot markers relevant
to KPI measurements.

Change-Id: Ia582cf99e12d85697eb5fef491c97d37b1b701eb
Signed-off-by: Rahul Agarwal <rahaga@codeaurora.org>