ANDROID: fix redefinition error for restricted vendor hooks

aosp inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7YFU9

Reference: https://android.googlesource.com/kernel/common/+/e706f27c765b



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Because of the multi-inclusion oddities of tracepoints, the
multi-inclusion protection in vendor_hooks.h caused issues
if more than 1 vendor hook header file with restricted vendor
hooks defined were included with "CREATE_TRACE_POINTS"
defined (redefinition of symbol errors).

The problem is fixed by removing the multiple-inclusion
protection as is done for regular tracepoints.

Fixes: 7f62740112ef ("ANDROID: add support for vendor hooks")
Bug: 163076069
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: Ic177db1693a6a2db58f08917e9115c7e6c2971b6
Signed-off-by: Yu Liao <liaoyu15@huawei.com>