clang-tidy: reduce repo-specific flags

Adjust the clang-tidy settings so that it does not need to have
a bunch of values related to the libpeci subproject.  In general
we should be ignoring any header files from any subprojects since
they are not under direct control of the repository-under-test.

Change-Id: I64d4e4bae20ca27aed68081b4270fa0ec8fc0543
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/src/IpmbSensor.hpp b/src/IpmbSensor.hpp
index bf94509..54a2a4a 100644
--- a/src/IpmbSensor.hpp
+++ b/src/IpmbSensor.hpp
@@ -46,7 +46,7 @@
 constexpr uint8_t netFn = 0x04;
 constexpr uint8_t getSensorReading = 0x2d;
 
-static bool isValid(const std::vector<uint8_t>& data)
+static inline bool isValid(const std::vector<uint8_t>& data)
 {
     constexpr auto readingUnavailableBit = 5;