Removed struct variables for storing states: sx, plt_rst, espi_rst.
While Sx & espi_rst state variables were totally redundant, plt_rst
variable had a use-case to prevent sending multiple callbacks to app.
Experimentally proven that use-case was not valid, as plt_rst isr
itself gets called only upon rising/falling edge.
Removing the condition to check plt_rst's current and previous state,
also solves the problem where global reset do not update plt_rst state.
Signed-off-by: Aditya Bhutada <aditya.bhutada@intel.com>
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