Update for kernel 6.1 headers.

The PERF_REG_EXTENDED_MASK macro is defined in at least two different
architectures perf_regs.h. Unfortunately, code was including all
of these headers separately, so undef this macro after each include
just to be sure it isn't used, and it doesn't conflict.

Test: Builds.
Change-Id: I248bf8f34830aee38fc6f713fcb29fca30867046
1 file changed