The correct bitops implementation depends on __LINUX_ARM_ARCH__ being
set. We do not currently support this variable. Change the default case
to < armv5, so that we do not end up with clz instructions in v4 code.
This is actually a workaround, the correct solution is to set
__LINUX_ARM_ARCH__ correctly.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>