msm: rpm-smd-debug: Remove unwanted pr_info

Remove printk which fills up the kernel buffer with not so useful
messages. In certain test scenarios this could flood the serial console
and could cause a crash.

CRs-fixed: 710614
Change-Id: Ie0265364fefc93d4c1a9044c60adc74758650593
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>