Apply consistent naming scheme for hostlib functions.

The chromeos-installer uses several functions from the vboot_reference
userspace library, but the names of those functions are inconsistent:

  IsZero
  MapFile
  VbGetSystemPropertyString
  cgpt_add
  cgpt_boot
  cgpt_create
  cgpt_get_boot_partition_number
  cgpt_get_num_non_empty_partitions
  cgpt_get_partition_details
  cgpt_prioritize
  cgpt_set_attributes
  find_kernel_config

The Google C++ style guide says types and functions should use CamelCase,
while variables use lower_case_with_underscores.

Kernel style (which vboot_reference tries to be more-or-less compatible
with) uses lower_case_with_underscores for everything, but that really only
has to apply to firmware stuff. For userspace, we can use the Google style.

BUG=chromium:221544
BRANCH=none
TEST=buildbot
CQ-DEPEND=CL:46045

Renaming/cleanup only; no functional changes.

Change-Id: I9c82c9ff8909be88586194c8ffdb435fc771195f
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/46044
diff --git a/cgpt/cmd_prioritize.c b/cgpt/cmd_prioritize.c
index b81bda0..05e7e0e 100644
--- a/cgpt/cmd_prioritize.c
+++ b/cgpt/cmd_prioritize.c
@@ -103,5 +103,5 @@
 
   params.drive_name = argv[optind];
 
-  return cgpt_prioritize(&params);
+  return CgptPrioritize(&params);
 }