staging: brcm80211: Remove dead code from linux_osl.c.

Removed several completely unused functions:
	osl_malloc_failed
	osl_pcmcia_attr
	osl_pcmcia_read_attr
	osl_pcmcia_write_attr
	osl_pktdup
and related macros

Signed-off-by: Henry Ptasinski <henryp@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>