msm: footswitch-8x60: Allow specification of per-fs reset delays

Custom reset rates can be specified for clocks via fs_clk_data. If
these rates are very low, then the default reset delay of 1us may
not be sufficient. Address this by allowing custom reset delays to
be specified on a per-footswitch bases.

Change-Id: Id9b9377d79436a7fe5007a8f37216a456d66ce1a
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>