pcm: recalculate all rules after changing hw_params flags

pcm: recalculate all rules after changing hw_params flags

The rules engine avoids recalculating rules that do not depend on
any changed parameter, but there is no mechanism to record changed
flags.  So when we change a flag, we have to ensure that all rules
depending on that flag are recalculated; the only method to do this
is to force recalculation of all rules.

So far, there have been no kernel drivers with rules depending
on flags, but rules to disable hardware SRCs by setting
SND_PCM_HW_PARAMS_NORESAMPLE are being introduced now.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>