ACPICA: Add "//" before ascii output of buffers.

ACPICA commit 657dc227672709895df3192fa5ea59a649b9a76f

Updates the dump buffer utility to comment out the ASCII part
of buffer dump. Prevents some tools from getting confused.

Link: https://github.com/acpica/acpica/commit/657dc227


Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>