vboot: Move GPT entry operator functions to gpt_misc

This is to allow external entities using vboot library
(e.g. depthcharge) to utilize these operator functions to perform get
/ set operations on GPT entry.

BUG=chrome-os-partner:45670
BRANCH=None
TEST=Compiles successfully "sudo emerge vboot_reference" "emerge-smaug
vboot_reference". "make -j runtests" successful.

Change-Id: I9e34a2a7afeae6293a78424794797d5755950888
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/301475
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
2 files changed