strip kernel modules more aggressively: make all global symbols local, rename all symbols in the symbol table to make them compress better

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add gpio-button-hotplug, like button-hotplug + gpio-keys-polled, fully compatible, but without the nasty input-core dependency chain

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kernel: strip unnecessary symbol table information from kernel modules, reduces default squashfs size on ar71xx by about 4k

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[juhosg:
- don't switch back to 2.6.39
- update config-3.2
- change machine id to SL-R7205
- reorder case entries in platform scripts
- remove button hotplug script]

Signed-off-by: Haipoh Teoh <hpteoh@ceedtec.com>

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brcmsmac does not work on bcm47xx based devices or has AP mode support for now.

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Thank you Eugene San for the patch

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This is commented out until we get report of working devices.

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This adds support for parsing sprom form nvram for sprom version form 1 to 9.
It also adds sprom from nvram support for devices on the bcma bus.

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gcc: use .eh_frame sections for exception handling stack unwind - saves about 400 bytes on every executable or shared library

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