We should only build hpet_example on x86[-64], where it is implemented.
It can cause build errors on other architectures.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Reported-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>