ChipCommon-attached serial flash support

configname: CONFIG_BCMA_SFLASH

Linux Kernel Configuration
└─>Device Drivers
└─>Broadcom specific AMBA
└─>ChipCommon-attached serial flash support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Some cheap devices have serial flash connected to the ChipCommon
instead of independent SPI controller. It requires using a separated
driver that implements ChipCommon specific interface communication.

Enabling this symbol will let bcma recognize serial flash and register
it as platform device.