acpisrc: Add LPIT table conversions.

The following commit hasn't correctly updated acpisrc, which breaks Linux
builds after the linuxized result has been merged by Linux kernel.
  Commit: 6d8ce6539f40de7b6259ca882d8b4fbcfac65708
  Subject: Add support for LPIT table.
This patch fixes this issue.  Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Executer: Fix buffer allocation issue for GenericSerialBus region field accesses.

The size of the buffer allocated for GenericSerialBus region access
is not correct.  This patch introduces AcpiExGetSerialAccessLength()
to be invoked to obtain correct data buffer length.  Reported by
Lan Tianyu, Fixed by Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Merge pull request #29 from zetalog/acpica-201404

Merge from Lv Zheng's Acpica 201404 tree.