SPI SWE: clear any pending boot-time interrupts in spi_init() Charger plug/unplug hw logic in the Iota ABB has no built-in debouncing, thus electrical contact bounce on the charging power connection interface produces a lot of charger plug/unplug interrupts. When we boot in charging mode (charging power present at boot time and is presumably the cause of Switch-ON), some bounce may occur between the initial Iota Switch-ON action and Calypso firmware booting. By clearing any accumulated ITSTATREG interrupts on boot, we prevent these pre-boot interrupts from generating charger plug/unplug events to FCHG, which would upset smooth from-boot charging.

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 *                      GSM Layer 1 software                                
 *              Copyright (c) Texas Instruments 1998                      
 * L1TM_TPU35.H
 *                                                                       
 *        Filename l1tm_tpu35.h
 *  Copyright 2003 (C) Texas Instruments  
 *                                                                        
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